(loading the tune titles - sorry about the delay)
Tune titles - O
| Title | Composer | Lyricist | Date | Key | Page |
| O (OH!) | Byron Gay & Arnold Johnson | 1919 | Bb | 686 | |
| OBJECT OF MY AFFECTION | Pinky Tomlin, Coy Poe & Jimmy Grier | 1934 | Ab | 303 | |
| OCEAN BLUES | Silvio Hein | Frank Craven | 1920 | C-G | 2573 |
| OCEANA ROLL | Lucien Denni | Roger Lewis | 1911 | C | 1495 |
| OCTOROON (instrumental) | Harry Warren | 1939 | F | 2380 | |
| ODE TO AN ALLIGATOR | Bob Zurke & Ruth Lowe | 1939 | Eb | 4345 | |
| ODE TO BECHET | Bob Wilber | 1984 | Bbm | 2468 | |
| OF ALL THE WRONGS YOU'VE DONE TO ME | Lew Payton, Chris Smith & Edgar Dowell | 1924 | G | 1027 | |
| OF THEE I SING | George Gershwin | Ira Gershwin | 1931 | Eb-G | 4188 |
| OF THEE I SING | George Gershwin | Ira Gershwin | 1931 | Eb-G-C | 4895 |
| OFF-TIME | Thomas "Fats" Waller & Harry Brooks | Andy Razaf | 1929 | F | 739 |
| OH BABY | Owen Murphy | 1928 | G | 174 | |
| OH BABY! | Andy Razaf, Jeff Clarkson & Eubie Blake | 1942 | F | 5653 | |
| OH BABY, SWEET BABY | Thomas "Fats" Waller | Ed Kirkeby | 1941 | F | 778 |
| OH BY JINGO! | Albert Von Tilzer | Lew Brown | 1919 | Em-G | 1560 |
| OH DADDY (BLUES) | William Russell & Ed Herbert | 1923 | F | 1278 | |
| OH DEATH WHERE IS THY STING | Clarence A. Stout | 1918 | Em-G | 1768 | |
| OH DIDN'T HE RAMBLE | J. Rosamond Johnson & Bob Cole (as Will Handy) | 1902 | G & Bb | 1881 | |
| OH DOCTOR | Rubey Cowan & Billy Joyce | 1920 | G | 1700 | |
| OH DORIS WHERE DO YOU LIVE? | Gus Kahn | 1927 | Eb | 1705 | |
| OH EDDIE! | Bennie Moten & Charlie Durham | 1930 | F | 4127 | |
| OH HELEN | Charles R. McCarron & Carey Morgan | 1918 | Eb | 2103 | |
| OH HOW SHE COULD YACKI HICKI WACKI WOO | Albert Von Tilzer | Stanley Murphy & Charles R. McCarron | 1916 | D-G | 3170 |
| OH JOE! GIT YOUR FIDDLE AND YOUR BOW | Ernie Pease & Anton Lada | Harry Pease | 1920 | C | 2506 |
| OH JOE, PLAY THAT TROMBONE | Edgar Dowell | 1922 | Bb | 3595 | |
| OH MABEL | Ted Fio Rito | Gus Kahn | 1924 | C | 1676 |
| OH ME! OH MY! | Vincent Youmans | Ira Gershwin (as Arthur Francis) | 1921 | C | 2602 |
| OH MISS HANNAH | Jessie L. Deppen | Thekla Hollingsworth | 1924 | Bb | 1106 |
| OH PAPA, OH PAPA | Nat Vincent & James F. Hanley | 1917 | Eb | 1716 | |
| OH PETER (YOU'RE SO NICE) | Herb Wiedoeft, Gene Rose & Jesse Stafford | 1924 | Bb | 1220 | |
| OH SARAH, WON'T YOU PLEASE PULL DOWN THAT SHADE | Clarence Gaskill | 1924 | Bb | 1899 | |
| OH SAY! CAN I SEE YOU TONIGHT | Henry Creamer, Joe Schuster & Leon Flatow | 1925 | C | 4567 | |
| OH SAY, WOULDN'T IT BE A DREAM | Joe Jordan | Earl C. Jones | 1933 | Eb | 10721 |
| OH SISTER AIN'T THAT HOT | Harry White & Will Donaldson | 1923 | C | 1102 | |
| OH SO SWEET | Chris Smith | Joseph McCarthy & Joe Goodwin | 1912 | Eb | 2096 |
| OH THAT NAVAJO RAG | Egbert Van Alstyne | Harry H. Williams | 1911 | Eb | 4375 |
| OH THOSE BLUES | Paul Biese & F. Henri Klickman | Isadore Murphy | 1916 | C | 1931 |
| OH THOSE EYES | Harry Ruby & M. K. Jerome | Bert Kalmar | 1925 | Gm-Bb | 1647 |
| OH VERA! | Nacio Herb Brown | 1925 | C | 4675 | |
| OH WHY, OH WHY DID I EVER LEAVE WYOMING? | Morey Amsterdam | 1946 | F | 4515 | |
| OH YOU BEAR CAT RAG | Lewis Muir & Fred Watson | William Tracey | 1910 | G | 3151 |
| OH YOU CAN'T FOOL AN OLD HOSS FLY | Blanche Franklyn, Nat Vincent & Harry Von Tilzer | 1924 | G | 2040 | |
| OH YOU DADDY | Ted Eastwood & Nat Vincent | 1917 | D-G | 1798 | |
| OH YOU GEORGIA ROSE | Bob Cole & Johnnie Waters | Shelton Brooks & W. R. Williams | 1912 | Bb | 2697 |
| OH! BABE! MAYBE SOMEDAY | Edward "Duke" Ellington | 1936 | C | 2097 | |
| OH! BOY, WHAT A GIRL | Frank Wright Bessinger | Bud Green | 1925 | F | 718 |
| OH! DOCTOR | Louis Panico | Phil Hopkins | 1930 | Eb | 5633 |
| OH! EVA, AINT YOU COMING OUT TONIGHT? | Harry Warren | Grant Clarke & Edgar Leslie | 1924 | G | 4589 |
| OH! FLO! | Walter Donaldson | Sam M. Lewis & Joe Young | 1924 | Eb | 10356 |
| OH! HOW I MISS YOU MAMMY | Harry D. Squires | Max C. Freedman | 1920 | G | 5503 |
| OH! HOW I WISH I COULD SLEEP | Pete Wendling | Sam M. Lewis & Joe Young | 1918 | C | 10413 |
| OH! IS SHE DUMB | Archie Gottler | Grant Clarke & Edgar Leslie | 1922 | C | 5154 |
| OH! JOHNNY | Abe Olman | Ed Rose | 1917 | Eb | 680 |
| OH! LAWDY | Henry Creamer & J. Turner Layton | 1919 | F | 4116 | |
| OH! LOOK AT ME NOW | Joe Bushkin | John Devries | 1941 | Eb | 539 |
| OH! LOOK AT THAT BABY | Walter Hirsch, Bennie Krueger & Joe Verges | 1927 | Ab | 4693 | |
| OH! MIN! | Isham Jones | Ole Olsen | 1918 | G | 2318 |
| OH! MO'NAH | Ted Weems & Country Washburn | 1931 | G | 247 | |
| OH! MY ACHIN' HEART | Freddy James, Little Jack Little & Jack Palmer | 1947 | Eb | 4846 | |
| OH! MY LADY (WON'T YOU LISTEN TO MY SERENADE?) | Ray Perkins | 1920 | D | 4801 | |
| OH! OH! SUGAR (BLUES) | Bernice Harris | 1931 | C | 10571 | |
| OH! SAY! DOCTOR! | Alfred Solman | Arthur J. Lamb | 1909 | G | 4937 |
| OH! WHAT IT SEEMED TO BE | Bennie Benjamin, George Weiss & Frankie Carle | 1945 | Eb | 636 | |
| OH! YOU BEAUTIFUL DOLL | Nat D. Ayer | A. Seymour Brown | 1911 | Eb | 51 |
| OH! YOU CRAZY MOON | James Van Heusen | Johnny Burke | 1939 | G | 478 |
| OH! YOU HAVE NO IDEA | Dan Dougherty | Phil Ponce | 1928 | Eb | 4563 |
| OH, BABE, WHAT WOULD YOU SAY | E. S. Smith | 1972 | C | 802 | |
| OH, BABY! (DON'T SAY NO, SAY MAYBE) | Walter Donaldson | Bud G. DeSylva | 1924 | C | 103 |
| OH, BABY! (DON'T SAY NO, SAY MAYBE) | Walter Donaldson | Bud G. DeSylva | 1924 | C | 10085 |
| OH, BROTHER! | Matt Malneck & Allie Wrubel | 1945 | Bb | 4760 | |
| OH, BUT I DO | Ella Fitzgerald & Kenneth Watts | 1945 | Eb | 645 | |
| OH, BUT I DO! | Arthur Schwartz | Leo Robin | 1946 | Eb | 10079 |
| OH, DESDEMONA | Ernie Loos & Bill Loos | 1923 | Eb | 5073 | |
| OH, HENRY! | Bonnie Benedict & F. Henri Klickmann | 1921 | Em-G | 10569 | |
| OH, HOW I CRIED THE MORNING AFTER | Will Gould & Joey Ray | 1930 | F | 2294 | |
| OH, IT MUST BE FUN | Cole Porter | 1950 | C | 4257 | |
| OH, LADY BE GOOD! | George Gershwin | Ira Gershwin | 1924 | G | 99 |
| OH, LADY BE GOOD! | George Gershwin | Ira Gershwin | 1924 | Em-G | 10058 |
| OH, MR. JOHNSON, TURN ME LOOSE! | Ben R. Harney | 1896 | G | 4956 | |
| OH, THAT BEAUTIFUL RAG | Ted Snyder | Irving Berlin | 1910 | F | 669 |
| OH, WHAT I'D DO FOR A GIRL LIKE YOU | Ted Snyder | George A. Whiting | 1909 | G | 10754 |
| OH, YOU DEVIL (RAG) | Ford T. Dabney | 1909 | C | 4732 | |
| O-HI-O (DOWN BY THE O-HI-O) | Abe Olman | Jack Yellen | 1920 | Eb | 2116 |
| OIGNONS, LES (THE ONIONS) | Sidney Bechet | 1953 | F-D-G | 4678 | |
| OKAY TOOTS | Walter Donaldson | Gus Kahn | 1934 | C | 4682 |
| OKAY, BABY | Maceo Pinkard | William Tracy | 1930 | Bb | 3872 |
| OKLAHOMA | Richard Rodgers | Oscar Hammerstein II | 1943 | C | 601 |
| OKLAHOMA INDIAN JAZZ | Ray Hibbeler, T. J. Johnsen, J. W. Barna, J. J. Murrin & T. Guarini | 1923 | Em-G | 3202 | |
| OL' BUTTERMILK SKY | Hoagy Carmichael | Jack Brooks | 1946 | Eb | 2487 |
| OL' MAN RIVER | Jerome Kern | Oscar Hammerstein II | 1927 | C | 4385 |
| OL' PAPPY | Al J. Neiburg, Marty Symes & Jerry Levinson | 1934 | C | 3864 | |
| OL, MAN MOSE | Louis Armstrong & Zilner Randolph | 1938 | Bb | 430 | |
| OLD AGE BLUES | Jess Williams | Pete Curtis | 1921 | Eb | 4561 |
| OLD BLACK MAGIC, THAT | Harold Arlen | Johnny Mercer | 1943 | Eb | 576 |
| OLD CHICAGO | Walter Melrose | 1948 | Bb | 5633 | |
| OLD CROW RAG | George Botsford | 1909 | G-G | 2838 | |
| OLD DEVIL MOON | Burton Lane | E. Y. Harburg | 1947 | F | 648 |
| OLD DOPE PEDDLER, THE | Tom Lehrer | 1953 | C | 2263 | |
| OLD FASHIONED LOVE | James P. Johnson | Richard C. McPherson (as Cecil Mack) | 1923 | F | 839 |
| OLD FASHIONED SWING | Joe Bishop | Winky Tharp | 1936 | F | 10835 |
| OLD FOLKS | Willard Robison | Dedette Lee Hill | 1938 | Eb | 427 |
| OLD FOLKS AT HOME (WAY DOWN UPON THE SWANEE RIVER) | Stephen C. Foster | 1903 | C | 1908 | |
| OLD FOLKS RAG | Wilbur C. Sweatman | 1914 | F-Bb | 2453 | |
| OLD FOLKS SHUFFLE | Clarence Williams & Thomas "Fats" Waller | 1926 | Ab-Db | 919 | |
| OLD FOLKS SHUFFLE | Thomas "Fats" Waller & Clarence Williams | 1926 | F-Bb | 10365 | |
| OLD GREY MARE IS BACK WHERE SHE USED TO BE, THE | Carson J. Robison | 1942 | F | 5549 | |
| OLD JOE BLADE | Nick LaRocca, Mercer Cook & J. Russel Robinson | 1936 | Eb | 3621 | |
| OLD JOE BLUES | L. Wolfe Gilbert, Joe Samuels & Nat Vincent | 1919 | F-Bb | 4018 | |
| OLD MAID BLUES | David Guion | Web Maddox | 1943 | C | 3402 |
| OLD MAIDS' BALL, THE | Irving Berlin | 1913 | Eb | 2183 | |
| OLD MAN BLUES | Edward "Duke" Ellington & Irving Mills | 1930 | C | 1107 | |
| OLD MAN HARLEM | Rudy Valee & Hoagy Carmichael | 1933 | G | 4831 | |
| OLD MAN JAZZ (A JAZZ PATROL) | Gene Quaw | 1920 | Cm-Eb | 3006 | |
| OLD MAN MOON | Hoagy Carmichael | 1937 | Eb | 2062 | |
| OLD MAN OF THE MOUNTAIN, THE | Victor Young | George Brown | 1932 | Gm | 3865 |
| OLD MAN ROMANCE | Hughie Price & Sonny Burke | 1943 | F | 2703 | |
| OLD MAN SUNSHINE, LITTLE BOY BLUEBIRD | Harry Warren | Mort Dixon | 1928 | G | 1455 |
| OLD MAN TIME | Cliff Friend & Jack Reynolds | 1961 | C | 5635 | |
| OLD MOTHER RILEY | Sturminster Newton & Melbury Bubb | 1935 | Fm-F | 1425 | |
| OLD MUSIC MASTER, THE | Hoagy Carmichael | Frank Loesser | 1943 | C | 10752 |
| OLD PIANO ROLL BLUES, THE | Cy Coben | 1949 | F | 908 | |
| OLD PLANTATION BLUES | F. Henri Klickman | Clinton Keithley | 1922 | Eb | 2227 |
| OLD PLAYMATE | Matt Malneck | Gus Kahn | 1931 | C | 751 |
| OLD RUGGED CROSS | George Bennard | 1913 | C | 2166 | |
| OLD SOFT SHOE, THE | Roy Jordan & Sid Bass | 1951 | G | 4269 | |
| OLD SOW SONG | Cyril Smith, Rudy Vallee & Elliot Daniels | 1937 | Eb | 436 | |
| OLD SPINNING WHEEL, THE | Billy Hill | 1933 | C | 302 | |
| OLD TIME BLUES | Perry Bradford | 1921 | C | 2936 | |
| OLD TIME SHUFFLE | Lloyd Glenn | 1957 | C | 2382 | |
| OLD VICTORIA CANADA | Ed Metz | 1994 | Bb | 4300 | |
| OLD VIRGINIA RAG | Clyde Douglass | 1907 | Eb-Ab | 4927 | |
| OLE MISS | W. C. Handy | 1916 | F-Bb | 40 | |
| OLE VIRGINNY BARBECUE | J. E. Andino | 1899 | Bb-Eb | 1851 | |
| OLGA | Joseph "King" Oliver & David Nelson | 1930 | Ab-Bb | 1889 | |
| OMAHA BLUES | Effie Tyus & Charles Tyus | 1924 | F | 2404 | |
| ON A CLEAR DAY (YOU CAN SEE FOREVER) | Burton Lane | Alan Jay Lerner | 1965 | G | 5318 |
| ON A LITTLE STREET IN SINGAPORE | Peter De Rose | Billy Hill | 1938 | C | 430 |
| ON A SLOWBOAT TO CHINA | Frank Loesser | 1948 | Bb | 1536 | |
| ON A STEAMER COMING OVER | Lou Handman | 1933 | Bb | 10840 | |
| ON A SUNNY AFTERNOON | Leroy Shield | 1936 | C | 5614 | |
| ON EASY STREET (IN RAGS) | J. Reginald MacEachron | 1902 | G-C | 4972 | |
| ON GREEN DOLPHIN STREET | Bronislaw Kaper | Ned Washington | 1947 | C | 659 |
| ON GREEN DOLPHIN STREET | Bronislaw Kaper | Ned Washington | 1947 | C | 10247 |
| ON MOBILE BAY | Charles N. Daniels | Earle C. Jones | 1910 | Ab | 5015 |
| ON MY FLOATING KIDNEY | Marty Gold, Harry Turen & Charles Koenig | Stan Fritts, Nels Laakso & Howard McElroy | 1943 | G | 1704 |
| ON PATROL IN NO MAN'S LAND | James Reese Europe, Noble Sissle & Eubie Blake | 1919 | Eb | 4187 | |
| ON REVIVAL DAY | Andy Razaf | 1931 | F | 748 | |
| ON THE ALAMO | Isham Jones | Gus Kahn (as Gilbert Keyes) & Joe Lyons | 1922 | Eb | 72 |
| ON THE ATCHISON, TOPEKA AND THE SANTA FE | Harry Warren | Johnny Mercer | 1945 | C | 4773 |
| ON THE BACK SEAT OF THE HENRY FORD | Lawrence Dillon | Will A. Dillon | 1916 | Eb | 1413 |
| ON THE BANKS OF THE WABASH | Paul Dresser | 1897 | Bb | 21 | |
| ON THE BANKS OF THE WABASH | Paul Dresser | 1897 | G-Bb | 10829 | |
| ON THE BEACH AT WAIKIKI (THE GOLDEN HULA) | Henry Kailimai | G. H. Stover | 1915 | Bb | 2129 |
| ON THE EIGHT O'CLOCK TRAIN | J. Russel Robinson | Marguerite Kendall | 1912 | C | 3214 |
| ON THE GIN GIN GINNY SHORE | Walter Donaldson | Edgar Leslie | 1922 | F | 2014 |
| ON THE GOOD SHIP LOLLIPOP | Sidney Clare & Richard A. Whiting | 1934 | C | 4773 | |
| ON THE GOOD SHIP WHIPPOORWILL | Walter Donaldson | Coleman Goetz | 1915 | C | 4391 |
| ON THE ISLE OF MAY | Andre Kostelanetz (from Tchaikovsky) | David Mack | 1940 | Eb | 519 |
| ON THE ISLE OF WICKI WACKI WOO | Walter Donaldson | Gus Kahn | 1923 | D | 4026 |
| ON THE NEW YORK, NEW HAVEN AND HARTFORD | Albert Von Tilzer | Frank Conroy | 1911 | Dm-F | 3755 |
| ON THE RADIO | Vincent Lopez & Owen Murphy | 1924 | C | 4291 | |
| ON THE ROAD TO HOME SWEET HOME (LIGHTING THE WAY FOR THE DOUGHBOY'S RETURN) | Egbert Van Alstyne | Gus Kahn | 1917 | G | 10487 |
| ON THE ROAD TO MANDALAY | Oley Speaks | 1907 | Eb-C | 667 | |
| ON THE SENTIMENTAL SIDE | James V. Monaco | Johnny Burke | 1938 | Bb | 444 |
| ON THE SOUTH SIDE OF CHICAGO | Phil Zeller | 1966 | C | 4192 | |
| ON THE STREET OF REGRET | Pete Wendling | John Klenner | 1941 | C | 562 |
| ON THE STREET WHERE YOU LIVE | Frederick Loewe | Alan Jay Lerner | 1956 | Bb | 2676 |
| ON THE STREETS OF ANTIBES | Sidney Bechet | 1958 | Eb-Ab | 1411 | |
| ON THE SUNNY SIDE OF THE STREET | Jimmy McHugh | Dorothy Fields | 1930 | C | 10097 |
| ON THE WAY UP | Edward "Duke" Ellington | 1960 | Db | 5350 | |
| ON THE WRONG SIDE OF THE FENCE | Allie Wrubel | Benee Russell | 1934 | F | 3197 |
| ON TREASURE ISLAND | Joe Burke | Edgar Leslie | 1935 | C | 1967 |
| ON WISCONSIN | W. T. Purdy | Carl Beck | 1920 | G | 4786 |
| ON WITH THE SHOW | Leroy Shield | 1930 | Eb-F-Bb | 5629 | |
| ONCE IN A LIFETIME | Leslie Bricusse & Anthony Newley | 1961 | Eb | 5320 | |
| ONCE IN A WHILE | Louis Armstrong, Lillian Hardin Armstrong & William H. Butler | 1927 | Bb & C | 3285 | |
| ONCE IN A WHILE | Michael Edwards | Bud Green | 1937 | Eb | 394 |
| ONCE IN A WHILE | Michael Edwards | Bud Green | 1937 | Eb | 10105 |
| ONCE IN LOVE WITH AMY | Frank Loesser | 1948 | G | 4385 | |
| ONE | Marvin Hamlisch | Edward Kleban | 1975 | Eb | 3109 |
| ONE ALONE | Sigmund Romberg | Otto Harbach & Oscar Hammerstein II | 1926 | Ab | 4848 |
| ONE AND TWO AND THREE AND FOUR | Henry Creamer & J. Turner Layton | 1919 | C | 3193 | |
| ONE DOZEN ROSES | Dick Jurgens & Walter Donovan | Roger Lewis & Country Washburn | 1942 | F | 565 |
| ONE FOOT IN HEAVEN | David Roth & Frances Aycock | 1946 | F | 4152 | |
| ONE FOOT IN THE GROOVE | Artie Shaw & Wen D'Aury | Artie Shaw | 1939 | Fm | 5164 |
| ONE FOR MY BABY (AND ONE MORE FOR THE ROAD) | Harold Arlen | Johnny Mercer | 1943 | Eb-G | 592 |
| ONE HOUR WITH YOU | Richard A. Whiting | Leo Robin | 1932 | G | 10106 |
| ONE HOUR WITH YOU (I'D LOVE TO SPEND) | Richard A. Whiting & Oscar Straus | Leo Robin | 1932 | G | 804 |
| ONE I LOVE BELONGS TO SOMEBODY ELSE, THE | Isham Jones | Gus Kahn | 1924 | F | 97 |
| ONE I LOVE BELONGS TO SOMEBODY ELSE, THE | Isham Jones | Gus Kahn | 1924 | G | 10243 |
| ONE I LOVE BEST, THE | Leroy Shield | 1930 | Eb | 5626 | |
| ONE IN A MILLION | Lew Pollack | Sidney D. Mitchell | 1936 | Bb | 3832 |
| ONE KISS | Gus Arnheim & Earl Burtnett | Leo Wood | Cm-C | 10671 | |
| ONE MAN BAND, THE | Ted Weems & Phil Baxter | 1931 | G | 3876 | |
| ONE MINUTE TO ONE | J. Fred Coots | Sam M. Lewis | 1933 | C | 10404 |
| ONE MORE KISS, THEN GOODNIGHT | Charles Tobias & Peter De Rose | 1931 | Bb | 3751 | |
| ONE MORE SONG ABOUT NEW ORLEANS | Betty O'Hara | Floyd Levin | 1985 | C | 2861 |
| ONE MORE TIME | Ray Henderson | Bud G. DeSylva & Lew Brown | 1931 | Em | 861 |
| ONE MORNING IN MAY | Hoagy Carmichael | Mitchell Parish | 1933 | F | 1011 |
| ONE O' THESE DAYS | Dave A. Hoffman | 1924 | Eb | 10568 | |
| ONE O'CLOCK JUMP | William "Count" Basie | 1938 | F-C | 414 | |
| ONE OF US WAS WRONG | Al Goering | Gus Kahn | 1931 | G | 3824 |
| ONE ROSE (THAT'S LEFT IN MY HEART), THE | Del Lyon & Lani McIntire | 1936 | Eb | 364 | |
| ONE STOLEN KISS | Gene Rodemich & Larry Conley | 1924 | C | 3260 | |
| ONE SWEET LETTER FROM YOU | Harry Warren | Lew Brown & Sidney Clare | 1927 | Eb | 869 |
| ONE THAT I LOVE LOVES ME, THE | Roy Turk & Fred E. Ahlert | 1929 | Eb | 3241 | |
| ONE, TWO, BUTTON YOUR SHOE | Arthur Johnston | Johnny Burke | 1936 | Eb | 379 |
| ONLY A MOMENT AGO | Milton Ager | Billy Rose | 1950 | F | 4879 |
| ONLY A ROSE | Brian Hooker & Rudolph Friml | 1925 | Fm-Ab | 4640 | |
| ONLY FOREVER | James V. Monaco | Johnny Burke | 1940 | G | 495 |
| ONLY ONE FOR ME, THE | Harry Akst | Benny Davis | 1927 | Eb | 3667 |
| ONLY WHEN YOU'RE IN MY ARMS | Con Conrad | Bert Kalmar & Harry Ruby | 1939 | C | 2397 |
| ONLY YOU | Buck Ram & Ande Rand | 1955 | G | 821 | |
| OOGIE, OOGIE WA WA (MEANS "I WANNA MAMA" TO AN ESKIMO) | Archie Gottler | Grant Clarke & Edgar Leslie | 1922 | C | 1721 |
| OOH! LOOK-A THERE, AIN'T SHE PRETTY? | Clarence Todd & Carmen Lombardo | 1933 | G | 3941 | |
| OOO ERNEST | Cliff Friend | Sidney Clare & Harry Tobias | 1922 | Eb | 4555 |
| OPEN THE DOOR RICHARD | Jack McVea & Dan Howell | John Mason & Dusty Fletcher | 1947 | Cm-C | 2826 |
| OPEN UP THE GOLDEN GATES TO DIXIELAND | Gus Van & Joe Schenck | Jack Yellen | 1919 | Bb | 3133 |
| OPEN YOUR ARMS, MY ALABAMY | George W. Meyer | Sam M. Lewis & Joe Young | 1922 | G | 1672 |
| OPEN YOUR HEART | Richard C. McPherson (as Cecil Mack) & James P. Johnson | 1923 | Bb | 3817 | |
| OPERA HOUSE RAG | Robert R. "Bob" Darch | 1960 | Fm-Ab-Db | 3114 | |
| OPHELIA RAG | James Scott | 1910 | C-F | 3033 | |
| OPUS ONE | Sy Oliver | Sid Garris (1945) | 1943 | G | 597 |
| ORANGE BLOSSOM RAG | Anton Lada, Joe Cawley & Alcide Nunez | 1919 | C-F | 5469 | |
| ORANGE COLORED SKY | Milton Delugg & Willie Stein | 1950 | Bb | 4467 | |
| ORCHIDS IN THE MOONLIGHT | Vincent Youmans | Edward Eliscu & Gus Kahn | 1933 | Fm-F | 10524 |
| ORGAN GRINDER | Clarence Williams | 1929 | C | 3210 | |
| ORGAN GRINDER'S BLUES | Clarence Williams | 1928 | C | 1574 | |
| ORGAN GRINDER'S SWING | Will Hudson | Mitchell Parish & Irving Mills | 1936 | G | 383 |
| ORIENTAL BLUES | Eubie Blake | Noble Sissle | 1920 | Dm-F | 3559 |
| ORIENTAL EYES | Paul Whiteman & Ferde Grofe | Leo Wood & Irving Bibo | 1922 | Gm | 4557 |
| ORIENTAL LOVE DREAMS | Earl Burtnett & Henry Miller | Harry D. Kerr | 1924 | Ab | 2920 |
| ORIENTAL STRUT | John A. St. Cyr | 1926 | Dm-F | 1519 | |
| ORIGINAL BLACK BOTTOM DANCE | Perry Bradford & Gus Horsley | 1926 | Bb | 1373 | |
| ORIGINAL CHARLESTON STRUT | Thomas Morris, William Russell & Clarence Williams | 1923 | Bb | 2871 | |
| ORIGINAL CHICAGO BLUES | James White | 1915 | F | 1046 | |
| ORIGINAL CHINESE BLUES | Fred Moore & Oscar Gardner | 1915 | Ab | 4679 | |
| ORIGINAL DIXIELAND ONE STEP | Domenick J. LaRocca & Joe Jordan (Trio) | 1917 | Bb-Eb-Ab-F | 45 | |
| ORIGINAL DIXIELAND ONE-STEP | Domenick J. LaRocca & Joe Jordan (Trio) | J. Russel Robinson & George Crandall | 1917 | G-C-F | 10353 |
| ORIGINAL RAGS | Scott Joplin | 1899 | G-C-G | 5 | |
| ORIOLE BLUES | Roy Maxon & Ted Fio Rito | Jack Stanley | 1922 | G | 3363 |
| ORY'S CREOLE TROMBONE | Edward "Kid" Ory | 1927 | F-Bb | 1014 | |
| OSHKOSH, WIS. | Sid Tepper & Roy Brodsky | 1947 | Eb | 5483 | |
| OSTRICH WALK | Domenick J. LaRocca & Larry Shields | 1917 | Eb | 1639 | |
| OUR BUNGALOW OF DREAMS | Joe Verges | Tommie Malie & Charles Newman | 1927 | F | 2353 |
| OUR DAY WILL COME | Mort Garson | Bob Hilliard | 1962 | G | 5536 |
| OUR LOVE | Larry Clinton, Buddy Bernier & Bob Emmerich (adapted from Tchaikovsky) | 1939 | G | 486 | |
| OUR LOVE AFFAIR | Arthur Freed & Roger Edens | 1940 | C | 516 | |
| OUR LOVE IS HERE TO STAY | George Gershwin | Ira Gershwin | 1938 | F | 2685 |
| OUR LOVE IS HERE TO STAY | George Gershwin | Ira Gershwin | 1938 | F | 4382 |
| OUR WALTZ | Dave Rose | 1942 | Bb | 589 | |
| OUT FOR NO GOOD | Harry Warren | Al Dubin | 1934 | Gm-G | 4369 |
| OUT IN FRISCO TOWN | Harry Carroll | Harold Atteridge | 1914 | D-G | 10439 |
| OUT IN THE COLD AGAIN | Rube Bloom | Ted Koehler | 1934 | F | 1652 |
| OUT OF BREATH | Everett Miller | Johnny Mercer | 1930 | F | 1022 |
| OUT OF NOWHERE | John Green | Edward Heyman | 1931 | G | 233 |
| OUT OF THE DARKNESS | Victor Young & Vee Lawnhurst | Roy Turk | 1932 | F | 4854 |
| OUT OF THE DAWN | Walter Donaldson | 1928 | F | 953 | |
| OUT THE WINDOW | William "Count" Basie & Ed Durham | 1939 | C | 457 | |
| OUT-O'-TOWN GAL | Walter Donaldson | 1923 | Eb | 3922 | |
| OUTSIDE | Frank Flynn | 1928 | C | 3919 | |
| OUTSIDE OF PARADISE | Peter Tinturin & Jack Lawrence | 1937 | Eb | 4763 | |
| OUTSIDE OF THAT (HE'S ALRIGHT WITH ME) | Clarence Williams | Jo Trent | 1923 | F | 1770 |
| OUTSKIRTS OF TOWN | Andy Razaf & William Weldon | 1937 | F | 385 | |
| OVER IN THE GLORY LAND | James W. Acuff & Emmett S. Dean | 1906 | Bb | 819 | |
| OVER THE RAINBOW | Harold Arlen | E. Y. Harburg | 1938 | Eb | 422 |
| OVER THE RAINBOW | Harold Arlen | E. Y. Harburg | 1938 | Eb | 10088 |
| OVERNIGHT | Louis Alter | Billy Rose & Charlotte Kent | 1930 | Eb | 2701 |
| OVERNIGHT HOP | Red Nichols & Billy Maxted | 1940 | C | 4106 | |
| OVERSEAS STOMP (LINDBERG HOP) | J. B. Jones & Will Shade | 1929 | C | 1344 | |
| OWL AND THE MOON, THE | Cyril Ornadel | David West | 1960 | F | 4545 |
| OZARK BLUES | Fred Rose | 1923 | G | 2780 | |
| OZARK MOUNTAIN BLUES | Roger Quincey Dickerson | 1929 | Ab | 4947 |