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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 Short Form Alternate History | ||
| * | Pericles the Tyrant | Lois Tilton |
| Panacea | Jason Stoddard | |
| Harvest Moon | William Barton | |
| A Key to the Illuminated Heretic | A. M. Dellamonica | |
| The 2005 Hugo Award Ceremony Script | Kim Newman and Paul McAuley | |
| Best Long Form Alternate History | ||
| * | The Summer Isles | Ian R. MacLeod |
| A Princess of Roumania | Paul Park | |
| Romanitas | Sophia McDougall | |