- Ogan, George (F.) (1912-1983) (stories)
- Writer and teacher. Born in Kirkwood, Missouri; lived in Louisiana.
- Ogan, Margaret (E. Nettles) (1923-1979) (stories)
- Teacher and writer, born in Columbia, Louisiana.
- Oglesby, W(illiam) H. Ellis (1966- ) (stories)
- Freelance writer in Atlanta, Georgia.
- OHiggins, Harvey J(errold) (1876-1929) (stories)
- Born in London, Ontario; educated at Toronto University; playwright and author.
- Olde, Nicholas; pseudonym of Amian Lister Champneys (1879-1951) (stories)
- See desturmobed.blogspot.com/2019/03/nicholas-olde.html
- Older, Mrs. Fremont [i.e., Cora Miranda Baggerly Older] (1875-1968) (stories)
- See www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=95828581
- OLeary, Frank (1902- ) (stories)
- Ex-convict; served time in Sing Sing for robbery; co-authored a book on prison dialect. Not to be confused with confused with animator and writer Frank OLeary (1922- ). Born in New York City.
- OLeary, Timothy (fl. 2010s) (stories)
- See timothyolearylit.com
- Oliphant, Ronald (1884-1968) (stories)
- See freespace.virgin.net/audrey.parnhamandco/Bhe/Laurie1.htm
- Oliver, Kelly (1958- ) (stories) (assoc.)
- See en.wikipedia.org/wiki/Kelly_Oliver
- Ollerman, Rick [i.e., Richard Carter Ollerman] (1963- ) (stories)
- Executive of an advertising agency in Florida.
- Olmsted, Harry F(rancis) (1889-1970) (stories)
- Born August 10, 1889 in Los Angeles; worked as a civil engineer before turning to fiction; claimed to have sold 1200 stories; died April 2, 1970 in Riverside, California.
- Olsen, Gregg (Donald) (1959- ) (stories) (assoc.)
- See en.wikipedia.org/wiki/Gregg_Olsen
- Olsen, Jack [i.e., John Edward Olsen] (1925-2002) (stories)
- Journalist, correspondent for Time magazine, editor of Sports Illustrated magazine; living in Washington state.
- Olson, Eugene E. (1936-2018) (stories)
- See en.wikipedia.org/wiki/Brad_Steiger
- OMahony, Charles Kingston (1884-1944) (stories)
- Born in Mitchelstown, County Cork, Ireland; educated in Dublin; author and journalist.
- ONeal, Patrick (Wisdom) (1927-1994) (stories) (assoc.)
- See en.wikipedia.org/wiki/Patrick_O%27Neal_(actor)
- ONeil, Denny [i.e., Dennis Joseph ONeil] (1939- ) (stories)
- See www.sf-encyclopedia.com/entry/oneil_dennis
- Onions, (George) Oliver (1873-1961) (stories)
- Changed his name legally to George Oliver in 1918, but continued to write as Oliver Onions.
- Onyebuchi, Tochi (fl. 2000s-2010s) (stories)
- See treize64.livejournal.com
- Oppenheim, E(dward) Phillips (1866-1946) (stories)
- See www.sf-encyclopedia.com/entry/oppenheim_e_phillips
- Opperman, K. A. (fl. 2010s) (stories)
- See kaopperman1.blogspot.co.uk
- Opperman, Meg (fl. 2010s) (stories)
- See megopperman.com
- Orban, Paul (1896-1974) (stories) (art) (assoc.)
- See pulpartists.com/Orban.html
- Orcutt, Eddy (fl. 1930s-1950s) (stories)
- Almost certainly resident in San Diego, California.
- Orczy, Baroness (Emmuska) [i.e., Emma Magdalena Rosalia Maria Josefa Barbara Barstow, Baroness Orczy] (1865-1947) (stories) (assoc.)
- See en.wikipedia.org/wiki/Baroness_Emma_Orczy
- Ordoñez, Justin (fl. 2010s) (stories)
- See www.sykosa.com/bio.html
- Ore, Rebecca; pseudonym of Rebecca Brown (1948- ) (stories)
- See www.sf-encyclopedia.com/entry/ore_rebecca
- OReilly, Nero (fl. 2010s) (stories)
- See www.trumpetshark.com
- Orloff, Alan (fl. 2010s) (stories) (assoc.)
- See www.alanorloff.com/alan.html
- ORourke, Frank (1916-1989) (stories)
- See www.sf-encyclopedia.com/entry/orourke_frank
- ORourke, Monica J. (fl. 1990s-2010s) (stories)
- See www.smashwords.com/profile/view/MonicaORourke
- Orrmont, Arthur (1922-2007) (stories)
- See prabook.com/web/arthur.orrmont/357060
- Orsi, Carlos [i.e., Carlos Orsi Martinho] (1971- ) (stories)
- See pt.wikipedia.org/wiki/Carlos_Orsi_Martinho
- Osborne, J. David (fl. 2010s) (stories)
- See www.brokenriverbooks.com
- Osborne, Lawrence (1958- ) (stories) (assoc.)
- See en.wikipedia.org/wiki/Lawrence_Osborne
- Osborne, William Hamilton (1873-1942) (stories)
- See www.jerseyhistory.org/findingaid.php?aid=1137
- Oster, Jerry (1943- ) (stories)
- Possibly a pseudonym.
- Ostrander, Isabel [i.e., Isabella Egenton Ostrander Lamb] (1883-1924) (stories)
- Born in New York City.
- OSullivan, William (fl. 1900s-1960s) (stories)
- probably a house pseudonym.
- Oswald, James (fl. 2010s) (stories)
- See jamesoswald.co.uk
- OToole, George J. (1936-2001) (stories)
- See www.sf-encyclopedia.com/entry/otoole_george
- Ottolengui, (Benjamin A.) Rodrigues (1861-1937) (stories) (assoc.)
- See www.sf-encyclopedia.com/entry/ottolengui_rodrigues
- Otway, Leslie (fl. 1920s-1930s) (art)
- See bearalley.blogspot.com/2007/01/leslie-otway.html
- Oursler, Grace (Perkins) (1900-1955) (stories)
- Born in Boston; educated at Columbia School of Journalism.
- Overholser, Stephen (1944- ) (stories)
- See www.sf-encyclopedia.com/entry/overholser_stephen
- Overholser, Wayne D. (1906-1996) (stories)
- See en.wikipedia.org/wiki/Wayne_D._Overholser
- Owen, David (Donald) (1956- ) (stories) (assoc.)
- See tasmanianartsguide.com.au/artists/writers/david-owen/
- Owen, Dean; pseudonym of Dudley Dean McGaughey (1909-1986) (stories)
- See www.sf-encyclopedia.com/entry/owen_dean
- Owen, Frank (1893-1968) (stories)
- See tellersofweirdtales.blogspot.co.uk/2015/06/frank-owen-1893-1968.html
- Owergoor, Dani (fl. 2010s) (stories) (art) (assoc.)
- See dani-owergoor.deviantart.com
- Ozaki, Milton K(iyoshi) (1913-1989) (stories)
- See en.wikipedia.org/wiki/Milton_K._Ozaki
- Pace, Richard (fl. 1990s-2010s) (art)
- See richardpace.daportfolio.com
- Packard, Frank (Lucius) (1877-1942) (stories) (assoc.)
- See www.sf-encyclopedia.com/entry/packard_frank_l
- Padley, Arthur Prescott (1905-1968) (stories)
- Born in Lancashire; died in Perth, Australia; author of short stories and plays.
- Page, Norvell W(ooten) (1904-1961) (stories) (assoc.)
- See www.sf-encyclopedia.com/entry/page_norvell_w
- Page, Stanley Hart (1902?-1979?) (stories)
- Born in New Jersey; a newspaperman in that state.
- Pain, Barry (Eric Odell) (1864-1928) (stories)
- See www.sf-encyclopedia.com/entry/pain_barry
- Paine, Lauran (Bosworth) (1916-2001) (stories)
- See www.sf-encyclopedia.com/entry/paine_lauran
- Painton, Frederick C. (1896?-1945) (stories)
- Writer, war correspondent. Died in Guam.
- Paisley, Yarrow (fl. 2000s-2010s) (stories)
- See yarrowpaisley.com
- Palencia, Elaine Fowler (fl. 1990s-2010s) (stories)
- See www.elainepalencia.com/
- Palmer, Delos, Jr. (1890-1960) (art)
- See pulpartists.com/Palmer.html
- Palmer, Raymond A(rthur) (1910-1977) (stories)
- See www.sf-encyclopedia.com/entry/palmer_raymond_a
- Palmer, (Charles) Stuart (Hunter) (1905-1968) (stories)
- Born in Baraboo, Wisconsin.
- Palmiotti, Jimmy [i.e., James Palmiotti] (1961- ) (stories) (assoc.)
- See en.wikipedia.org/wiki/Jimmy_Palmiotti
- Palumbo, Dennis (Joseph) (1951- ) (stories) (assoc.)
- See www.sf-encyclopedia.com/entry/palumbo_dennis
- Pandian, Gigi (fl. 2010s) (stories) (assoc.)
- See gigipandian.com
- Pangborn, Edgar (1909-1976) (stories)
- See www.sf-encyclopedia.com/entry/pangborn_edgar
- Paniez, Evelyne (fl. 2010s) (stories) (art) (assoc.)
- See www.secretdartiste.be
- Paoli, Gina (fl. 2010s) (stories)
- See ginapaoli.com
- Paretsky, Sara (1947- ) (stories) (assoc.)
- See en.wikipedia.org/wiki/Sara_Paretsky
- Parker, Eric R. (1898-1974) (art)
- See illustrators.wikia.com/wiki/Eric_R._Parker_(1898-1974)
- Parker, John (William, II) (1917-2004) (art)
- See allevents.in/johnstown/john-parker-collection-pulp-fiction-and-illustrations-40s-70s/103223443729938
- Parker, Robert (Bogardus, Jr.) (1905-1955) (stories)
- Born in Newark, New Jersey; educated at Union College, Schenectady, New York; newspaperman with the New York Journal; then foreign correspondent for Associated Press, headquartered in Paris and later in Budapest; lastly United Nations bureau chief for the New York Daily News.
- Parker, Samuel (fl. 2010s) (stories) (assoc.)
- See www.samuelparkerbooks.com
- Parker, T. Jefferson (1953- ) (stories) (assoc.)
- See en.wikipedia.org/wiki/T._Jefferson_Parker
- Parkhill, Forbes (1892-1974) (stories)
- Born and lived in Denver; died in San Diego.
- Parkhurst, H(arry) L(emon) V(ictor) (1876-1962) (stories) (art)
- See pulpartists.com/Parkhurst.html
- Parmer, Charles (Brower) (1893-1958) (stories)
- Editor and reporter, born in Nashville, Tennessee; died in Alexandria, Virginia; editor, reporter and radio broadcaster.
- Parsons, Julie (1951- ) (stories) (assoc.)
- Born in New Zealand; a TV talk show producer living in Dublin.
- Parsons, Kelly (fl. 2010s) (stories) (assoc.)
- See kellyparsonsbooks.com
- Parsons, Paul D. (fl. 2010s) (stories)
- See pauldparsons.com/bio.htm
- Passey, Steve (fl. 2010s) (stories)
- See stevepassey.wordpress.com
- Patenaude, Roland (Joseph) (1912-1989) (art)
- See pulpartists.com/Patenaude.html
- Paterson, J(ames) Phillips (1877-1948) (art)
- See bearalley.blogspot.co.uk/2017/08/j-phillips-paterson.html
- Patri, Angelo (1876-1965) (stories)
- See en.wikipedia.org/wiki/Angelo_Patri
- Patten, William George (1866-1945) (stories)
- Author of numerous Frank Merriwell novels under the pseudonym Burt L. Standish. Born in Corinna, Maine; died in Vista, California. Note: Patten was born William George Patten and is carried that way in some bibliographies.
- Patterson, James (Brendan) (1947- ) (stories) (assoc.)
- See www.sf-encyclopedia.com/entry/patterson_james
- Pattinson, James (1915-2009) (stories)
- See www.telegraph.co.uk/news/obituaries/culture-obituaries/books-obituaries/6762886/James-Pattinson.html
- Pattison, (Joseph) Eliot (1951- ) (stories) (assoc.)
- See www.sf-encyclopedia.com/entry/pattison_eliot
- Paul, Barbara (Jeanne) (1931- ) (stories) (assoc.)
- See www.sf-encyclopedia.com/entry/paul_barbara
- Paul, Frank R(udolph) (1884-1963) (stories) (art)
- See pulpartists.com/PF.html
- Paul, Robert S. (1915- ) (stories)
- Son of Frank R. Paul.
- Paul, Suzanne (fl. 2010s) (stories)
- See www.spaulfiction.com/8.html
- Paulsen, Gary (Melvin) (1939- ) (stories)
- See www.sf-encyclopedia.com/entry/paulsen_gary
- Paust, Gil(bert Harry) (1912-1988) (stories)
- Free-lance writer and the 14th editor of Adventure magazine. An expert on outdoor sports such as hunting and fishing, and also knowledgeable about aeronautics. His claim to hold a Ph.D. in physics from Columbia University cannot be substantiated. Born in and resident of Yonkers, New York. Like Alden Norton before him and Bruce Cassiday after him, Gil Paust contributed prolifically to Adventure, but because he used a number of pseudonyms, his contributions are not realized.