

2007: Michael Chabon, The Yiddish Policemen's Union ( 2007).2006: Charles Stross, Merchant Princes volumes 1-3: The Family Trade ( 2004), The Hidden Family ( 2005) and The Clan Corporate ( 2006).2005: Ian R MacLeod, The Summer Isles (October/November 1998 Asimov's exp 2005).2004: Philip Roth, The Plot Against America ( 2004).2003: Murray Davies, Collaborator ( 2003).2002: (tie) Martin J Gidron, The Severed Wing ( 2002) Harry Turtledove, Ruled Britannia ( 2002).2001: J N Stroyar, The Children's War ( 2001).

2000: Mary Gentle, Ash: A Secret History ( 2000).1999: Brendan DuBois, Resurrection Day ( 1999).1998: Stephen Fry, Making History ( 1996).1997: Harry Turtledove, How Few Remain ( 1997).1995: Paul J McAuley, Pasquale's Angel ( 1994).The 2019 awards which would normally have been presented in 2020 were held over until the 2021 Worldcon (at which the 2020 awards were also presented) owing to complications caused by the coronavirus pandemic. These are listed by year of presentation. Special Achievement awards are occasionally presented, either to mark notable examples of alternate history which precede the founding of the Sidewise Awards (after the manner of the Retro Hugos) or as career achievement honours. The winners below are listed by their year of eligibility, theoretically corresponding to first English language publication but usually – for non-US work – deferred until first US publication.

The awards' name is a homage to Murray Leinster's short Timeslip/ Parallel Worlds story "Sidewise in Time" (June 1934 Astounding). These annual awards for Alternate History fiction were conceived in 1995 by Evelyn C Leeper, Robert B Schmunk and Steven H Silver, and have since been presented annually in two categories, Long Form for works of more than 60,000 words and Short Form for works (including poems) of less than 60,000 words.
