The Robert W. Clarke Trophy is presented annually to the AHL's champion of the Western Conference during the playoffs. Prior to 1998, it was given to the champion of the Southern Conference/Division.
The award is named after former AHL Chairman of the Board Robert W. Clarke.
| Awarded for | Year | Team | Win |
|---|---|---|---|
| Southern Division playoffs champion | 1990 | Rochester Americans | 1 |
| 1991 | Rochester Americans | 2 | |
| 1992 | Rochester Americans | 3 | |
| 1993 | Rochester Americans | 4 | |
| 1994 | Cornwall Aces | 1 | |
| 1995 | Cornwall Aces | 2 | |
| Southern Conference playoffs champion | 1996 | Rochester Americans‡ | 5 |
| 1997 | Hershey Bears‡ | 1 | |
| Western Conference playoffs champion | 1998 | Philadelphia Phantoms‡ | 1 |
| 1999 | Rochester Americans | 6 | |
| 2000 | Rochester Americans | 7 | |
| 2001 | Wilkes-Barre/Scranton Penguins | 1 | |
| 2002 | Chicago Wolves‡ | 1 | |
| 2003 | Houston Aeros‡ | 1 | |
| 2004 | Milwaukee Admirals‡ | 1 | |
| 2005 | Chicago Wolves | 2 | |
| 2006 | Milwaukee Admirals | 2 | |
| 2007 | Hamilton Bulldogs‡ | 1 | |
| 2008 | Chicago Wolves‡ | 3 | |
| 2009 | Manitoba Moose | 1 | |
| 2010 | Texas Stars | 1 | |
| 2011 | Houston Aeros | 2 | |
| 2012 | Toronto Marlies | 1 | |
| 2013 | Grand Rapids Griffins‡ | 1 | |
| 2014 | Texas Stars‡ | 2 | |
| 2015 | Utica Comets | 1 | |
| 2016 | Lake Erie Monsters‡ | 1 | |
| 2017 | Grand Rapids Griffins‡ | 2 | |
| 2018 | Texas Stars | 3 | |
| 2019 | Chicago Wolves | 4 | |
| 2020 | Not awarded due to the COVID-19 pandemic | ||
| 2021 | Not awarded; playoffs not held[1] | ||
| 2022 | Chicago Wolves‡ | 5 | |
| 2023 | Coachella Valley Firebirds | 1 | |