The Thomas D. Clareson Award for Distinguished Service is presented for outstanding service activities-promotion of SF teaching and study, editing, reviewing, editorial writing, publishing, organizing meetings, mentoring, and leadership in SF/fantasy organizations.
| 2015 | Farah Mendlesohn |
| 2014 | Lisa Yaszek |
| 2013 | Rob Latham |
| 2012 | Arthur B. Evans |
| 2011 | The Tiptree Motherboard (Karen Joy Fowler, Debbie Notkin, Ellen Klages, Jeanne Gomoll, Jeff Smith, Pat Murphy) |
| 2010 | David Mead |
| 2009 | Hal Hall |
| 2008 | Andy Sawyer |
| 2007 | Michael Levy |
| 2006 | Paul Kincaid |
| 2005 | Muriel Becker |
| 2004 | Patricia Warrick |
| 2003 | Joe Sanders |
| 2002 | Joan Gordon |
| 2001 | Donald "Mack" Hassler |
| 2000 | Arthur O. Lewis |
| 1999 | David G. Hartwell |
| 1998 | Elizabeth Anne Hull |
| 1997 | James Gunn |
| 1996 | Frederik Pohl |