Oates, Joyce Carol, (1938- )
--Feral, #566, September, 1998. (novelet)
--In Shock, #585, June, 2000. (novelet)
--The Haunting, #616, April, 2003.

O'Brien, Fitz-James,
--The Lost Room, #1, Fall, 1949. (reprint)

O'Connell, Jack,
--Legerdemain (In memory of Roger Cormier), #600, October-November, 2001. (novelet)
--The Swag from Doc Hawthorne's, #614, February, 2003. (novelet)

O'Donohoe, Nick,
--To Dust You Will Return, #337, June, 1979.

Olin, Richard,
--Lil, Rorrity, and a Foamin' Sea of Steam Beer, March, 1966.
--King Frog, #324, May, 1978.

Oliver, Chad, (1928-1993)
--Technical Advisor, #21, February, 1953.
--Anachronism, #23, April, 1953.
--Transformer, #42, November, 1954.
--Artifact, #49, June, 1955. (novelet)
--North Wind, #58, March, 1956.
--also see Beaumont, Charles, and Chad Oliver
--also see Oliver, Chad, and Charles Beaumont

Oliver, Chad, and Charles Beaumont,
--The Last Word, #47, April, 1955. *

Oltion, Jerry, (1957- )
--The Grass Is Always Greener, February, 1993. (novelet)
--Blue Light Special, September, 1993.
--Abridged Edition, July, 1994.
--The Great Martian Pyramid Hoax, January, 1995.
--Uncertainty, December, 1995.
--The Plight Before Christmas, January, 1996.
--There Goes the Neighborhood, August, 1996.
--Abandon in Place, December, 1996. (novella)
--The Difference Between Science Fiction and Fantasy, #549, March, 1997. (long short short)
--The Miracle, #568, December, 1998.
--Biosphere, #574, June, 1999.
--The Pain in the Ass, #587, August, 2000.
--The Unfamiliar, #612, December, 2002.
--also see Oltion, Jerry, and Kristine Kathryn Rusch
--also see Patterson, Kent, and Jerry Oltion

Oltion, Jerry, and Kristine Kathryn Rusch,
--Deus X, #556, October-November, 1997. (novella)

O'Neil, Dennis,
--The Kiling of Mother Corn, February, 1975.
--Wave By, #352, September, 1980.

O'Neill, Gene,
--The White Quetzal, #410, July 1985.

Onions, Oliver, (George Oliver Onions)
--Rooum, #1, Fall, 1949.

Onopa, Robert,
--The Lights, #411, August, 1985.
--Traffic, March, 1995.
--Camping in the Biosphere Reserve, May, 1996.
--The Grateful Dead, #565, August, 1998. (novelet)
--Name That Moon, #591, January, 2001. (novelet)
--Geropods, #608, July, 2002.

Onspaugh, Carl,
--see Brown, Fredric, and Carl Onspaugh

Ore, Rebecca,
--My Mother, the Alien, and Me, #550, April, 1997.
--Accelerated Grimace, #559, February, 1998.

Ottum, Bob,
--Chirp Me a Story, #51, August, 1955. (short short)