Award Years for Sidewise Awards for Alternate History
| 1990's: | - | - | - | - | - | 1995 | 1996 | 1997 | 1998 | 1999 |
| 2000's: | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 |
| 2010's: | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 |
| 2020's: | 2020 | - | - | - | - | - | - | - | - | - |
| Best Long Form Alternate History | ||
| Win | The Children's War | J. N. Stroyar |
| Nomination | Chronospace | Allen Steele |
| Nomination | Series "The Age of Unreason" (Newton's Cannon, A Calculus of Angels, Empire of Unreason, The Shadows of God) | J. Gregory Keyes |
| Best Short Form Alternate History | ||
| Win | The Human Front | Ken MacLeod |
| Nomination | First to the Moon! | Stephen Baxter and Simon Bradshaw |