| Author | Title | Authors | Box | Genre | Tags |
| O'Brian, Elmer (wiki) | Varieties of Mystic Experience (wiki) | | A4 (wiki) | Non-Fiction (wiki) | Non-Fiction (wiki) |
| O'Brien, Joanne (wiki) | State of Religion Atlas, The (wiki) | O'Brien, Joanne; Palmer, Martin (wiki) | A94 (wiki) | Reference (wiki) | Reference (wiki) |
| O'Connell, Robert L. (wiki) | Of Arms and Men (wiki) | | A51 (wiki) | Non-Fiction (wiki) | Non-Fiction (wiki) |
| O'Donnel, Peter (wiki) | Modesty Blaise (wiki) | | B25 (wiki) | Action (wiki) | Action (wiki) |
| O'Donnell, Kevin Jr (wiki) | Fire on the Border (wiki) | | B36 (wiki) | Sci Fi (wiki) | Sci Fi (wiki) |
| O'Donnell, Kevin Jr (wiki) | Journeys of McGill Feighan Book I: Caverns (wiki) | | B34 (wiki) | Sci Fi (wiki) | R (wiki) Sci Fi (wiki) |
| O'Donnell, Kevin Jr (wiki) | Journeys of McGill Feighan Book II: Reefs (wiki) | | B34 (wiki) | Sci Fi (wiki) | R (wiki) Sci Fi (wiki) |
| O'Donnell, Kevin Jr (wiki) | Journeys of McGill Feighan Book III: Lava (wiki) | | B34 (wiki) | Sci Fi (wiki) | R (wiki) Sci Fi (wiki) |
| O'Donnell, Kevin Jr. (wiki) | Journeys of McGill Feighan: Book IV Cliffs (wiki) | | B7 (wiki) | Sci Fi (wiki) | R (wiki) Sci Fi (wiki) |
| O'Donnell, Kevin Jr. (wiki) | Oracle (wiki) | | B7 (wiki) | Sci Fi (wiki) | Sci Fi (wiki) |
| O'Donnell, Peter (wiki) | I, Lucifer (wiki) | | A27 (wiki) | Action (wiki) | Action (wiki) Modesty Blaise (wiki) |
| O'Donnell, Peter (wiki) | Modesty Blaise (wiki) | | A26 (wiki) | Action (wiki) | Action (wiki) |
| O'Donoghue, Michael (wiki) | National Lampoon Encyclopedia of Humor (wiki) | | A72 (wiki) | Comic (wiki) | Comic (wiki) |
| O'Donohoe, Nick (wiki) | Too Too Solid Flesh (wiki) | | B9 (wiki) | Sci Fi (wiki) | Sci Fi (wiki) |
| O'Hare, Jeff (wiki) | Villains and Vigilantes: Tackle the T.O.T.E.M 2013 (wiki) | | A45 (wiki) | Game (wiki) | Game (wiki) |
| O'Keefe, Richard A. (wiki) | Craft of Prolog, The (wiki) | | A98 (wiki) | Computer (wiki) | C++ (Computer Language) (wiki) Computer (wiki) Prolog (Computer Language) (wiki) |
| O'Malley, Daniel (wiki) | Rook, The: A Novel (wiki) | | E2 (wiki) | Audiobook (wiki) | Audiobook (wiki) |
| O'Neil, Dennis (wiki) | Private Files of the Shadow (wiki) | | A57 (wiki) | Comic (wiki) | Comic (wiki) |
| O'Neil, Denny (wiki) | Shadow: 1941, The (wiki) | | A49 (wiki) | Comic (wiki) | Comic (wiki) |
| O'Neill, Gerard K. (wiki) | High Frontier, The (wiki) | | B33 (wiki) | Sci Fi (wiki) | Sci Fi (wiki) |
| O'Reilly (wiki) | UNIX CD Bookshelf (wiki) | | A19 (wiki) | Computer (wiki) | C++ (Computer Language) (wiki) Computer (wiki) UNIX (wiki) |
| O'Riordan, Robert (wiki) | Cadre Lucifer (wiki) | | B2 (wiki) | Sci Fi (wiki) | Sci Fi (wiki) |
| O'riordan, Robert (wiki) | Cadre Messiah (wiki) | | B23 (wiki) | Fantasy (wiki) | Fantasy (wiki) |
| O'Riordan, Robert (wiki) | Cadre One (wiki) | | B2 (wiki) | Sci Fi (wiki) | Sci Fi (wiki) |
| O'Rourke, P.J. (wiki) | Holidays in Hell (wiki) | | A102 (wiki) | Non-Fiction (wiki) | Non-Fiction (wiki) Travel (wiki) |
| O'Shea, Tim (wiki) | Artificial Intelligence: Tools, Techniques, and Applications (wiki) | O'Shea, Tim; Eisenstadt, Marc (wiki) | A3 (wiki) | Computer (wiki) | AI (wiki) Computer (wiki) |
| O'Sullivan, Steffan (wiki) | Fantasy Bestiary (wiki) | | A32 (wiki) | Game (wiki) | Game (wiki) |
| O'Sullivan, Steffan (wiki) | Swashbucklers (wiki) | | A36 (wiki) | Game (wiki) | Game (wiki) |
| O'Toole, G.J.A. (wiki) | Honorable Treachery - A History of U.S. Intelligence, Espionage, and Covert Action from the American Revolution to the CIA (wiki) | | A99 (wiki) | Non-Fiction (wiki) | Non-Fiction (wiki) |
| Oaks, Scott (wiki) | Java Security (wiki) | | A3 (wiki) | Computer (wiki) | Computer (wiki) Computer Security (wiki) Java (Computer Language) (wiki) |
| Oaks, Scott (wiki) | Jini in a Nutshell (wiki) | Oaks, Scott; Wong, Henry (wiki) | A9 (wiki) | Computer (wiki) | Computer (wiki) Java (Computer Language) (wiki) |
| Oberg, James Edward (wiki) | New Earths - Restructuring Earth and Other Planets (wiki) | | A103 (wiki) | Non-Fiction (wiki) | Illustrated (wiki) Non-Fiction (wiki) |
| Ockham (wiki) | Ockham's Theory of Terms - Part 1 of the Summa Logicae (wiki) | | A101 (wiki) | Philosophy (wiki) | Philosophy (wiki) |
| Odom, Mel (wiki) | Lethal Interface (wiki) | | A4 (wiki) | Sci Fi (wiki) | Detective (wiki) Sci Fi (wiki) |
| Off The Wall Games (wiki) | Professional Wrestling (wiki) | | C1 (wiki) | Game (wiki) | Game (wiki) |
| Offut, Andrew J. (wiki) | Iron Lords, The (wiki) | | A27 (wiki) | Fantasy (wiki) | Fantasy (wiki) |
| Ogden, C K (wiki) | Meaning of Meaning (wiki) | | A51 (wiki) | Philosophy (wiki) | Philosophy (wiki) |
| Olander, Joseph D. (wiki) | School and Society Through Science Fiction (wiki) | Olander, Joseph D.; Greenberg, Martin Harry (wiki); Warrick, Patricia (wiki) | A103 (wiki) | Sci Fi (wiki) | Sci Fi (wiki) |
| Olander, Jospeh D. (wiki) | Microcosmic Tales (wiki) | Asimov, Isaac (wiki); Greenberg, Martin H. (wiki); Olander, Jospeh D. | A85 (wiki) | Sci Fi (wiki) | Sci Fi (wiki) |
| Olbermann, Keith (wiki) | Truth and Consequences (wiki) | | A77 (wiki) | Non-Fiction (wiki) | Non-Fiction (wiki) Politics (wiki) |
| Oliphant, Margaret (wiki) | Atlas of the Ancient World (wiki) | | A67 (wiki) | Reference (wiki) | Atlas (wiki) Reference (wiki) |
| Oliver, Larry (wiki) | 2000 One Liners (wiki) | | B19 (wiki) | Comedy (wiki) | Comedy (wiki) |
| Olmesdahl, Bill (wiki) | High Lords' Guide to the Possibility Wars - The GM's Guide to TORG, The (wiki) | Farshtey, Greg (wiki); Olmesdahl, Bill | A107 (wiki) | Game (wiki) | Game (wiki) |
| Olney, Ross R. (wiki) | Tales of Time and Space (wiki) | | A44 (wiki) | Anthology (wiki) | Anthology (wiki) Sci Fi (wiki) |
| Olsen (wiki) | Detroit Noir (wiki) | Olsen; Hocking, John C. (wiki) | A34 (wiki) | Anthology (wiki) | Anthology (wiki) |
| Olson, Don Sherwood (wiki) | Manager Pool (wiki) | Olson, Don Sherwood; Stimmel, Carol L. (wiki) | A10 (wiki) | Computer (wiki) | Computer (wiki) |
| Olson, Lynne (wiki) | Those Angry Days (wiki) | | G1 (wiki) | Audiobook (wiki) | Audiobook (wiki) History (wiki) |
| Olson, Melissa F. (wiki) | Boundary Crossed (wiki) | | E2 (wiki) | Audiobook (wiki) | Audiobook (wiki) |
| Ono, Hideichi (wiki) | Everyday Expressions in Japanese (wiki) | | B40 (wiki) | Non-Fiction (wiki) | Japanese (wiki) Non-Fiction (wiki) |
| Opie, Iona (wiki) | My Very First Mother Goose (wiki) | | A82 (wiki) | Kids (wiki) | Illustrated (wiki) Kids (wiki) |
| Oppel, Kenneth (wiki) | Airborn (wiki) | | A43 (wiki) | Fantasy (wiki) | Fantasy (wiki) |
| Oram, John (wiki) | Copenhagen Affair, The (wiki) | | B31 (wiki) | Action (wiki) | Action (wiki) |
| Oram, Neil (wiki) | Storms Howling Through Tiflis, The (wiki) | | B25 (wiki) | Fantasy (wiki) | Fantasy (wiki) R (wiki) |
| Oram, Neil (wiki) | Warp 2: Lemmings on the Edge, The (wiki) | | A4 (wiki) | Sci Fi (wiki) | R (wiki) Sci Fi (wiki) |
| Orczy, Baroness (wiki) | Scarlet Pimpernel, The (wiki) | | B2 (wiki) | Historical Fiction (wiki) | Historical Fiction (wiki) |
| Orfali, Robert (wiki) | Instant Corba (wiki) | Orfali, Robert; Harkey, Dan (wiki); Edwards, Jeri (wiki) | A15 (wiki) | Computer (wiki) | C++ (Computer Language) (wiki) Computer (wiki) |
| Orlow, Sanford M. (wiki) | Data Abstraction and OO Programming in C++ (wiki) | Garlen, Keith E. (wiki); Orlow, Sanford M.; Pelxico, Perry S. (wiki) | A13 (wiki) | Computer (wiki) | C++ (Computer Language) (wiki) Computer (wiki) Object Oriented (wiki) Software Development (wiki) |
| Orsborn, Carol (wiki) | How Would Confucius Ask for a Raise (wiki) | | A16 (wiki) | Professional (wiki) | Professional (wiki) |
| Ortho Books (wiki) | All About Garden Pools and Fountains (wiki) | | A116 (wiki) | Non-Fiction (wiki) | Non-Fiction (wiki) |
| Ortho Books (wiki) | Finish Carpentry Basics (wiki) | | A116 (wiki) | Non-Fiction (wiki) | Non-Fiction (wiki) |
| Ortho Books (wiki) | Home Offices (wiki) | | A117 (wiki) | Non-Fiction (wiki) | Non-Fiction (wiki) |
| Ortho Books (wiki) | How to Design and Build Decks and Patios (wiki) | | A116 (wiki) | Non-Fiction (wiki) | Non-Fiction (wiki) |
| Ortho Books (wiki) | Tiling Basics (wiki) | | A117 (wiki) | Non-Fiction (wiki) | Non-Fiction (wiki) |
| Orwell (wiki) | Novel: 1984 (wiki) | | B13 (wiki) | Sci Fi (wiki) | R (wiki) Sci Fi (wiki) |
| Orwell, George (wiki) | 1984 (Novel) (wiki) | | B18 (wiki) | Sci Fi (wiki) | Sci Fi (wiki) |
| Orwell, George (wiki) | 1984 (Novel) (wiki) | | B30 (wiki) | Sci Fi (wiki) | R (wiki) Sci Fi (wiki) |
| Orwell, George (wiki) | 1984 (Novel) (wiki) | | B34 (wiki) | Sci Fi (wiki) | R (wiki) Sci Fi (wiki) |
| Orwell, George (wiki) | Animal Farm (wiki) | | B2 (wiki) | Fiction (wiki) | Fiction (wiki) R (wiki) |
| Oster, Adam (wiki) | Legend of Buddy Hero, The (The Defenders Saga) (wiki) | | E1 (wiki) | Superhero (wiki) | Kindle (wiki) Superhero (wiki) |
| Ostrogorsky, George (wiki) | History of the Byzantine State (wiki) | | A1 (wiki) | History (wiki) | History (wiki) |
| Ostrovsky, Victor (wiki) | Way of Deception, the (wiki) | Ostrovsky, Victor; Hoy, Claire (wiki) | A4 (wiki) | Non-Fiction (wiki) | Non-Fiction (wiki) |
| Oswald, Ian (wiki) | Sleep (wiki) | | B33 (wiki) | Paranormal (wiki) | Paranormal (wiki) |
| Ott, Wolfgang (wiki) | Sharks and Little Fish (wiki) | | B31 (wiki) | Fiction (wiki) | Fiction (wiki) |
| Ottum, Bob (wiki) | All Right, Everybody off the Planet (wiki) | | B34 (wiki) | Sci Fi (wiki) | R (wiki) Sci Fi (wiki) |
| Oualline, Steve (wiki) | Practical C++ Programming (wiki) | | A13 (wiki) | Computer (wiki) | C++ (Computer Language) (wiki) Computer (wiki) Software Development (wiki) |
| Owen, Bill (wiki) | Judges Guild: Treasury of Archaic Names Vol 1 (wiki) | | A45 (wiki) | Game (wiki) | Game (wiki) Judges Guild (RPG) (wiki) RPG (wiki) |
| O’Shea, M.V. (editor) (wiki) | World Book, The: Organized Knowledge in Story and Picture (1925 Edition), Vol 1 (wiki) | | A114 (wiki) | Non-Fiction (wiki) | Non-Fiction (wiki) |
| O’Shea, M.V. (editor) (wiki) | World Book, The: Organized Knowledge in Story and Picture (1925 Edition), Vol 10 (wiki) | | A114 (wiki) | Non-Fiction (wiki) | Non-Fiction (wiki) |
| O’Shea, M.V. (editor) (wiki) | World Book, The: Organized Knowledge in Story and Picture (1925 Edition), Vol 2 (wiki) | | A114 (wiki) | Non-Fiction (wiki) | Non-Fiction (wiki) |
| O’Shea, M.V. (editor) (wiki) | World Book, The: Organized Knowledge in Story and Picture (1925 Edition), Vol 3 (wiki) | | A114 (wiki) | Non-Fiction (wiki) | Non-Fiction (wiki) |
| O’Shea, M.V. (editor) (wiki) | World Book, The: Organized Knowledge in Story and Picture (1925 Edition), Vol 4 (wiki) | | A114 (wiki) | Non-Fiction (wiki) | Non-Fiction (wiki) |
| O’Shea, M.V. (editor) (wiki) | World Book, The: Organized Knowledge in Story and Picture (1925 Edition), Vol 5 (wiki) | | A114 (wiki) | Non-Fiction (wiki) | Non-Fiction (wiki) |
| O’Shea, M.V. (editor) (wiki) | World Book, The: Organized Knowledge in Story and Picture (1925 Edition), Vol 6 (wiki) | | A114 (wiki) | Non-Fiction (wiki) | Non-Fiction (wiki) |
| O’Shea, M.V. (editor) (wiki) | World Book, The: Organized Knowledge in Story and Picture (1925 Edition), Vol 7 (wiki) | | A114 (wiki) | Non-Fiction (wiki) | Non-Fiction (wiki) |
| O’Shea, M.V. (editor) (wiki) | World Book, The: Organized Knowledge in Story and Picture (1925 Edition), Vol 8 (wiki) | | A114 (wiki) | Non-Fiction (wiki) | Non-Fiction (wiki) |
| O’Shea, M.V. (editor) (wiki) | World Book, The: Organized Knowledge in Story and Picture (1925 Edition), Vol 9 (wiki) | | A114 (wiki) | Non-Fiction (wiki) | Non-Fiction (wiki) |