- Tuttiett, Mary Gleed (1847-1923) (stories)
- Born in the Isle of Wight; in adult life was strong advocate for womens rights; lived most of her life in Ealing, London, where she died.
- Tuttle, Lisa (1952- ) (stories) (assoc.)
- See www.sf-encyclopedia.com/entry/tuttle_lisa
- Tuttle, W(ilbur) C(oleman) (1883-1969) (stories) (art) (assoc.)
- See pulpflakes.blogspot.com/2012/06/wc-tuttle-western-short-story-and-movie.html
- Tutton, Barbara (Ivy Curtis) [born Barbara Ivy Jones] (1914- ) (stories)
- Born in Romford, England.
- Twain, Mark; pseudonym of Samuel Langhorne Clemens (1835-1910) (stories) (assoc.)
- See en.wikipedia.org/wiki/Mark_Twain
- Tweed, John (1869-1933) (stories) (assoc.)
- See en.wikipedia.org/wiki/John_Tweed
- Tweed, Thomas F(rederick) (1890-1940) (stories) (assoc.)
- See www.sf-encyclopedia.com/entry/tweed_thomas_f
- Tweedie, Ethel Brilliana (1862-1940) (stories) (assoc.)
- See en.wikipedia.org/wiki/Ethel_Brilliana_Tweedie
- Twells, [Canon] Henry (1823-1900) (stories) (assoc.)
- See en.wikipedia.org/wiki/Henry_Twells
- Twidle, Arthur (1864-1936) (stories) (art)
- See bearalley.blogspot.co.uk/2018/03/arthur-twidle.html
- Tworkowska, Magdalena (fl. 2010s) (art)
- See tworkowska.com
- Twose, Henry Elias (1874-1944) (stories)
- Born in Plymouth, Devon, England; arrived in the U.S. in 1896; became a naturalized U.S. citizen in 1918; died in Los Angeles. Novelist, stage actor, playwright and magazine writer.
- Twyman, H(arold) W(illiam) (1873-1971) (stories) (art)
- Born in London; educated at King Edwards School, Witley; periodical editor and writer.
- Tydings, Joseph D(avies) (1928- ) (stories)
- See en.wikipedia.org/wiki/Joseph_Tydings
- Tyers, Kathy [i.e., Kathleen Luanne Moore Tyers] (1952- ) (stories)
- See www.sf-encyclopedia.com/entry/tyers_kathy
- Tyler, Anne [i.e., Anne Tyler Mondarressi] (1941- ) (stories) (assoc.)
- See en.wikipedia.org/wiki/Anne_Tyler
- Tyler, Charles W(arren) (1887-1952) (stories)
- See mysteryfile.com/blog/?p=17703
- Tyler, George Charles (1904-1983?) (stories)
- Born in Bristol, England; educated at Temple Technical School, Bristol; editor, various newspapers.
- Tymn, Marshall B(enton) (1937- ) (stories) (assoc.)
- See www.sf-encyclopedia.com/entry/tymn_marshall_b
- Tynan, Katharine [i.e., Katharine Tynan Hinkson] ({c}1859-1931) (stories)
- See en.wikipedia.org/wiki/Katharine_Tynan
- Tyndale, Walter (Frederick Roofe), R.I. (1855-1943) (stories)
- See en.wikipedia.org/wiki/Walter_Tyndale
- Tyndall, John (1820-1893) (stories) (assoc.)
- See en.wikipedia.org/wiki/John_Tyndall
- Tynes, John (Scott) (1971- ) (stories) (art)
- See en.wikipedia.org/wiki/John_Tynes
- Tyng, Griswold (1883-1960) (art)
- Born in Dorchester, Massachusetts; was alive in Jamaica Plain, Massachusetts, in 1962.
- Tyrer, Walter (1900-1978) (stories)
- Prolific author of juvenile fiction in England, with perhaps 20 million words of output.
- Tyrrell, G(eorge) W(alter) (1883-1961) (stories) (assoc.)
- See www.cb5.co.uk/tyrrell.htm
- Tyrrell, George (1861-1909) (stories) (assoc.)
- See en.wikipedia.org/wiki/George_Tyrrell
- Tyrwhitt, [Reverend] Richard St. John (1827-1895) (stories)
- See en.wikipedia.org/wiki/Richard_St_John_Tyrwhitt
- Tyrwhitt-Drake, [Sir] (Hugh) G(arrard) (1881-1964) (stories)
- See en.wikipedia.org/wiki/Garrard_Tyrwhitt-Drake
- Tyson, J(ohn) Aubrey (1870-1930) (stories)
- See desturmobed.blogspot.com/2019/01/j-aubrey-tyson.html
- Tyssen-Amherst, William (Amhurst, , 1st Baron Amherst of Hackney, né Daniel-Tyssen) (1835-1909) (stories) (assoc.)
- See en.wikipedia.org/wiki/William_Tyssen-Amherst,_1st_Baron_Amherst_of_Hackney
- Tytus, Grace S(eeley) H(enop) (1875-1928) (stories)
- See www.thetrustees.org/assets/documents/finding-aids/Grace_Seeley_Henop_Tytus_McLennan_Papers_finding_aid.pdf
- Tytus, R(obb) de Peyster (1876-1913) (stories)
- See www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=110568813
- Ubbelohde, Alfred (René Jean Paul) (1907-1988) (stories) (assoc.)
- See en.wikipedia.org/wiki/Alfred_Ubbelohde
- Udall, Brady (1971- ) (stories)
- See en.wikipedia.org/wiki/Brady_Udall
- Uderzo, Albert [i.e., Alberto Aleandro Uderzo] (1927- ) (stories) (assoc.)
- See en.wikipedia.org/wiki/Albert_Uderzo
- Uglow, Jennifer (Sheila, née Crowther) (1947- ) (stories) (assoc.)
- See en.wikipedia.org/wiki/Jenny_Uglow
- Uitvlugt, Donald Jacob (fl. 2000s-2010s) (stories)
- See haikufiction.blogspot.co.uk
- Ulbach, Louis (1822-1889) (stories)
- See en.wikipedia.org/wiki/Louis_Ulbach
- Ulbrickson, Al(vin M.) (1903-1980) (stories)
- University of Washington rowing coach; father of the Olympic rower of the same name.
- Ulitskaya, Lyudmila (1943- ) (stories)
- See en.wikipedia.org/wiki/Lyudmila_Ulitskaya
- Ullian, Peter (fl. 1990s-2010s) (stories)
- See www.peterullian.com
- Ullman, Albert E(dward) (1879-?) (stories)
- Born in Kentucky; worked for Street & Smith as a magazine writer around WWI; lived in New York City.
- Ullman, Betty E. (1916?-1997?) (stories) (assoc.)
- Artist and photographer in Washington D.C.
- Ullman, James Michael (1925-1997) (stories)
- Newspaperman in Chicago.
- Ullman, Liv (Johanne) (1938- ) (stories) (assoc.)
- See en.wikipedia.org/wiki/Liv_Ullmann
- Ullmann, Linn [born Karin Beate Ullmann] (1966- ) (stories)
- See en.wikipedia.org/wiki/Linn_Ullmann
- Ulm, Charles (Thomas Philippe) (1898-1934) (stories) (assoc.)
- See en.wikipedia.org/wiki/Charles_Ulm
- Ulreich, Eduard Buk (1889-1966) (art)
- See www.askart.com/artist/Eduard_Buk_Ulreich/4308/Eduard_Buk_Ulreich.aspx
- Ulriksen, Mark (1957- ) (art)
- See en.wikipedia.org/wiki/Mark_Ulriksen
- Umberto I of Italy [i.e., Umberto Ranieri Carlo Emanuele Giovanni Maria Ferdinando Eugenio di Savoia] (1844-1900) (stories) (assoc.)
- See en.wikipedia.org/wiki/Umberto_I_of_Italy
- Umbleja, Kadri (fl. 2000s-2010s) (stories) (art) (assoc.)
- See www.modelmayhem.com/1891591
- Umbstaetter, H(erman) D(aniel) (1851-1913) (stories)
- Born in Ohio; worked on newspapers in Cleveland, New York and Baltimore; became magazine publisher in Boston.
- Umezu, Kazuo (1936- ) (stories) (assoc.)
- See en.wikipedia.org/wiki/Kazuo_Umezu
- Ümit, Ahmed (1960- ) (stories) (assoc.)
- See en.wikipedia.org/wiki/Ahmet_Ümit
- Underberg, Tom (fl. 2010s) (stories)
- See www.tomunderberg.com
- Underwood, Edna Worthley (1873-1961) (stories)
- See en.wikipedia.org/wiki/Edna_W._Underwood
- Underwood, Francis Henry (1825-1894) (stories)
- See en.wikipedia.org/wiki/Francis_H._Underwood
- Underwood, Michael R. (fl. 2000s-2010s) (stories) (assoc.)
- See michaelrunderwood.com
- Underwood, Sophie (née) Kerr (1880-1965) (stories)
- See www.encyclopedia.com/arts/news-wires-white-papers-and-books/underwood-sophie-kerr
- Underwood, Tim (Edward) (1948- ) (stories) (assoc.)
- See www.sf-encyclopedia.com/entry/underwood_tim
- Unferth, Deb Olin (1969- ) (stories)
- See en.wikipedia.org/wiki/Deb_Olin_Unferth
- Ungar, Antonio (1974- ) (stories)
- See en.wikipedia.org/wiki/Antonio_Ungar
- Unger, Kimberly (fl. 2010s) (stories)
- See www.ungerink.com
- Ungerer, Tomi (1931-2019) (art)
- See en.wikipedia.org/wiki/Tomi_Ungerer
- Unser, Bobby [i.e., Robert William Unser] (1934- ) (stories) (assoc.)
- See en.wikipedia.org/wiki/Bobby_Unser
- Untermeyer, Louis (1885-1977) (stories) (assoc.)
- See en.wikipedia.org/wiki/Louis_Untermeyer
- Updegraff, Allan (Eugene) (1883-1965) (stories)
- Born in Grinnell, Iowa, died more than likely in Paris, France.
- Updike, John (Hoyer) (1932-2009) (stories) (assoc.)
- See en.wikipedia.org/wiki/John_Updike
- Upham, Steve (fl. 2000s-2010s) (stories) (art) (assoc.)
- See www.screamingdreams.com
- Upkins, Dennis R. (fl. 2010s) (stories)
- See dennisupkins.wordpress.com
- Upshall, Helen (Ruby) (1926- )
- Born Helen Ruby Beaumont in Bournemouth.
- Upshaw, Garth (fl. 2000s-2010s) (stories)
- See www.beneath-ceaseless-skies.com/authors/garth-upshaw/
- Upson, Arthur (Wheelock) (1877-1908) (stories) (assoc.)
- See en.wikipedia.org/wiki/Arthur_Upson
- Upson, William Hazlett (1891-1975) (stories)
- See pulpflakes.blogspot.com/2012/05/william-hazlett-upson-creator-of.html
- Upton, Lee (1953- ) (stories)
- See en.wikipedia.org/wiki/Lee_Upton
- Uptton, Clive (1911-2006) (art)
- See en.wikipedia.org/wiki/Clive_Uptton
- Upward, Allen (1863-1926) (stories)
- See www.sf-encyclopedia.com/entry/upward_allen
- Urell, William Francis (1913-1979) (stories)
- Born in Casper, Wyoming; died in Orange, California.
- URen, W(illiam) S(imon) (1859-1949) (stories) (assoc.)
- See en.wikipedia.org/wiki/William_Simon_U%27Ren
- Urey, Harold C(layton) (1893-1981) (stories) (assoc.)
- See en.wikipedia.org/wiki/Harold_Urey
- Uricchio, William (Charles) (1952- ) (stories) (assoc.)
- See en.wikipedia.org/wiki/William_Uricchio
- Urie, Chris (fl. 2010s) (stories)
- See chrisurie.com
- Uris, Leon (Marcus) (1924-2003) (stories)
- See en.wikipedia.org/wiki/Leon_Uris
- Urmanov, Albert (fl. 2010s) (art)
- See albert-urmanov.blogspot.de
- Urner, Mabel Herbert [Mrs. Lathrop Colgate Harper] (1881-1957) (stories)
- See dlib.nyu.edu/findingaids/html/nyhs/harper/bioghist.html
- Urner, Nathan D(ane) (1839-1893) (stories)
- Born in Cincinnati; died in New York City; City Editor of the New York Tribune.
- Urquhart, (William) Macgregor (1916-1967) (stories)
- Born in Aberdeen; freelance journalist and competition expert.
- Urquhart, Paul; joint pseudonym of Ladbroke Black (1877-1940) & Thomas Cox Meech (1868-1940) (stories)
- See bearalley.blogspot.co.uk/2007/09/paul-urquhart-ladbroke-black-thomas.html
- Urquhart, [Sir] Thomas (1611-1660) (stories)
- See en.wikipedia.org/wiki/Thomas_Urquhart
- Usborne, Richard (Alexander) (1910-2006) (stories) (assoc.)
- See en.wikipedia.org/wiki/Richard_Usborne
- Uslan, Michael (1951- ) (stories) (assoc.)
- See en.wikipedia.org/wiki/Michael_Uslan
- Utley, George (1887-1966) (stories)
- See en.wikipedia.org/wiki/George_Utley
- Utley, Steven (D.) (1948-2013) (stories) (assoc.)
- See www.sf-encyclopedia.com/entry/utley_steve
- Utter, Robert Palfrey (1875-1936) (stories)
- Educationist and author. Born in Olympia, Washington; died in Berkeley, California.
- Utz, Thornton (Robyn) (1914-2000) (stories) (art)
- See www.curtispublishing.com/bios/Utz.shtml
- Uzumé, Setsu (fl. 2010s) (stories)
- See katanapen.wordpress.com
- V, Ram (fl. 2010s) (stories)
- See www.ram-v.com