| Old Forts of the Great Lakes | Barry, James P. | "U.S. History - Military"
| 155 | 1994 | 7 | 1996-07-11 |
| Old Glory | Raban, Jonathan | "Travel"
| 409 | 1981 | 7 | 2013-11-26 |
| Old Hickory | Davis, Burke | "U.S. History - Political"
| 386 | | 7 | 1989-05-15 |
| Old London Bridge | Pierce, Patricia | "World History - Cultural"
| 295 | 2001 | 6 | 2003-06-17 |
| Old Man and the Sea, The | Hemingway, Ernest | "Fiction - Adventure"
| 127 | 1952 | 8 | 1996-01-27 |
| Old Possum's Book of Practical Cats | Eliot, T.S. | "Poetry Collections"
| 24 | 1939 | 7 | 1994-04-08 |
| Old Reliable, The | Wodehouse, P.G. | "Fiction - Humorous Novels"
| 123 | 1951 | 6 | 2021-02-27 |
| Old Times on the Upper Mississippi | Merrick, George Byron | "Travel"
| 305 | 1909 | 8 | 1997-02-15 |
| Old Tippecanoe | Cleaves, Freeman | "U.S. History - Political"
| 343 | 1939 | 8 | 1989-09-20 |
| Old Ways, The | Macfarlane, Robert | "Travel"
| 448 | | 6 | 2013-06-22 |
| Old Yeller | Gipson, Fred | "Fiction - Chapter Books"
| 117 | 1956 | 5 | 1997-05-12 |
| Oliver Twist | Dickens, Charles | "Fiction - General"
| 494 | 1838 | 6 | 1989-05-04 |
| Olura | Household, Geoffrey | "Fiction - Mystery"
| 224 | 1965 | 5 | 2022-10-10 |
| Omega-Minus | Allbeury, Ted | "Fiction - Adventure"
| 181 | 1976 | 7 | 1993-01-03 |
| On a Slow Train Through Arkansaw | Jackson, Thomas William | "Humor"
| 96 | 1903 | 5 | 2023-07-26 |
| On Beyond Zebra! | Seuss, Dr. | "Picture Book"
| 48 | 1955 | 7 | 1997-08-30 |
| On Desperate Ground | Sides, Hampton | "U.S. History - Military"
| 337 | 2018 | 8 | 2021-08-27 |
| On Her Majesty's Secret Service | Fleming, Ian | "Fiction - Adventure"
| 190 | 1963 | 8 | 1989-02-24 |
| On Jungle Trails | Buck, Frank | "Travel"
| 280 | 1936 | 5 | 2004-05-08 |
| On Kingdom Mountain | Mosher, Howard Frank | "Fiction - Adventure"
| 357 | 2014 | 6 | 2023-09-13 |
| On the Banks of Plum Creek | Wilder, Laura Ingalls | "Fiction - General"
| 339 | 1937 | 7 | 2002-10-13 |
| On the Beach | Shute, Nevil | "Fiction - Adventure"
| 234 | 1957 | 8 | 1987-08-06 |
| On the Island | Graves, Tracey Garvis | "Fiction - Adventure"
| 319 | 2012 | 5 | 2025-09-14 |
| On the Road | Kerouac, Jack | "Fiction - General"
| 310 | 1957 | 2 | 1993-01-23 |
| On the Run | MacDonald, John D. | "Fiction - Mystery"
| 224 | 1963 | 5 | 2015-07-22 |
| On the Water | Stone, Nathaniel | "Travel"
| 317 | 2002 | 7 | 2013-11-30 |
| On the Wing | Tennant, Alan | "Nature/Science"
| 301 | 2004 | 7 | 2005-03-12 |
| On War | Clausewitz, Carl von | "Philosophy"
| 310 | 1832 | 6 | 1995-11-05 |
| On Writing Well | Zinsser, William | "Literature/Essays"
| 294 | 1976 | 7 | 2002-02-27 |
| Once and Future King, The | White, T.H. | "Fiction - S. F./Fantasy"
| 639 | 1958 | 7 | 1998-04-20 |
| Once More Around the Park | Angell, Roger | "Sports"
| 351 | 1991 | 8 | 2022-12-18 |
| Once Upon a Telephone | Stern, Emily Gwathmey and Ellen | "Reference/Miscellaneous"
| 133 | 1994 | 5 | 2001-01-19 |
| One Corpse Too Many | Peters, Ellis | "Fiction - Mystery"
| 192 | 1979 | 8 | 1997-10-18 |
| One Day in the Life of Ivan Denisovich | Solzhenitsyn, Alexander | "Fiction - General"
| 158 | 1962 | 7 | 1994-11-20 |
| One Fearful Yellow Eye | MacDonald, John D. | "Fiction - Mystery"
| 224 | 1966 | 8 | 1989-07-13 |
| One Fish, Two Fish, Red Fish, Blue Fish | Seuss, Dr. | "Picture Book"
| 63 | 1960 | 7 | 1996-10-02 |
| One Flew Over the Cuckoo's Nest | Kesey, Ken | "Fiction - General"
| 272 | 1962 | 5 | 1997-08-02 |
| One for the Money | Evanovich, Janet | "Fiction - Mystery"
| 290 | 1994 | 8 | 2001-01-07 |
| One for the Road | Horwitz, Tony | "Travel"
| 206 | 1987 | 7 | 2014-05-11 |
| One Hundred Days | Schom, Alan | "World History - Military"
| 324 | | 6 | 1992-12-12 |
| One Hundred Years of Solitude | Marquez, Gabriel Garcia | "Fiction - S. F./Fantasy"
| 417 | 1967 | 4 | 2015-05-09 |
| One Man's Meat | White, E.B. | "Literature/Essays"
| 270 | 1942 | 8 | 2025-06-19 |
| One Man's Mountains | Patey, Tom | "Travel"
| 282 | 1971 | 4 | 2015-10-05 |
| One Man's West | Lavender, David | "Autobiographies, Memoirs and Biographies"
| 322 | 1956 | 6 | 2026-02-06 |
| One Monday We Killed Them All | MacDonald, John D. | "Fiction - Mystery"
| 192 | 1961 | 5 | 2015-08-09 |
| One More Spring | Nathan, Robert | "Fiction - General"
| 127 | 1933 | 6 | 2024-04-28 |
| One More Sunday | MacDonald, John D. | "Fiction - Mystery"
| 311 | 1984 | 5 | 2008-10-07 |
| One More Warbler | Emanuel, Victor | "Nature/Science"
| 252 | 2017 | 4 | 2019-01-31 |
| One Morning in Maine | McCloskey, Robert | "Fiction - Chapter Books"
| 59 | 1952 | 8 | 1998-12-08 |
| One of Our Thursdays Is Missing | Fforde, Jasper | "Fiction - S. F./Fantasy"
| 0 | 2011 | | |
