Award Years for Sidewise Award
| 1990's: | - | - | - | - | - | 1995 | 1996 | 1997 | 1998 | 1999 |
| 2000's: | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 |
| 2010's: | 2010 | 2011 | - | - | - | - | - | - | - | - |
| Best Long Form Alternate History | ||
| * | When Angels Wept: A What-If History of the Cuban Missile Crisis | Eric G. Swedin |
| Columbia & Britannia | Brian A. Dixon and Adam Chamberlain | |
| Red Inferno: 1945 | Robert Conroy | |
| Pinion | Jay Lake | |
| Best Short Form Alternate History | ||
| * | A Clash of Eagles | Alan Smale |
| Mammoths of the Great Plains | Eleanor Arnason | |
| Alten Kameraden | Barry B. Longyear | |
| Sidewinders | Ken MacLeod | |
| Goin' Down to Anglotown | William F. Wu | |
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