| Convention | Dates | GoHs |
|---|---|---|
| OryCon 0 | November 11, 1978 | (No GoHs) |
| OryCon 1 | November 9-11, 1979 | John Varley, Richard Geis |
| OryCon '80 | November 14-16, 1980 | Fritz Leiber (Pro), Elton Elliott (Fan) |
| OryCon '81 | October 30-November 1, 1981 | Frederik Pohl (Pro) and Kennedy Poyser (Fan) |
| OryCon '82 | November 12-14, 1982 | Robert Silverberg, Jeff Frane |
| OryCon V | November 11-13, 1983 | Octavia Butler, Bob Tucker |
| OryCon '84 | November 9-11, 1984 | Reginald Bretnor |
| OryCon '85 | November 8-10, 1985 | Somtow Sucharitkul, Bill Rotsler, Jon Singer |
| OryCon '86 | November 7-9, 1986 | Edward Bryant (Pro) and Jessica Amanda Salmonson (Editor) |
| OryCon '87 | November 13-15, 1987 | Tim Powers, Ben Yalow |
| OryCon 10 | November 11-13, 1988 | Lucius Shepard, John Varley, Connie Willis, Mona Clee |
| OryCon 11 | November 10-12, 1989 | Michael Bishop, David Langford |
| OryCon 12 | November 9-11, 1990 | Howard Waldrop, K. W. Jeter |
| OryCon 13 | November 8-10, 1991 | Emma Bull, Will Shetterly |
| OryCon 14 | November 20-22, 1992 | Esther Friesner, James Warhola, Steve Forty |
| OryCon 15 | November 12-14, 1993 | Terry Pratchett Pro), Mark Ferrari (Artist) & Robert Lionel Fanthorpe (Special Guest) |
| OryCon 16 | November 11-13, 1994 | Tappan King (Pro), Beth Meacham (Editor), Real Musgrave (Artist) & Pat Cadigan (Special Guest) |
| OryCon 17 | November 10-12, 1995 | Joel Rosenberg (Writer), Heather Hudson & Dameon Willich (Artists), Kristine Kathryn Rusch & Dean Wesley Smith (Special Guests) |
| OryCon 18 | November 8-10, 1996 | Diane Duane & Peter Morwood (Writers), Patricia Davis (Artist), Gardner Dozois (Editor) |
| OryCon 19 | November 7-9, 1997 | Steven Barnes (Writer) , Patrick & Teresa Nielsen Hayden (Editors), Frank Lurz (Artist) |
| OryCon 20 | November 13-15, 1998 | Lois McMaster Bujold,, Ellen Asher, David Langford. Howard Waldrop, Kathe Koja, Alan Clark, Robert Lionel Fanthorpe |
| OryCon 21 | November 12-14, 1999 | Néné Thomas, Warren Lapine, Angela Kessler, Nicola Griffith, Charles Sheffield, Bill Bowers |
| OryCon 22 | November 17-19, 2000 | Kara Dalkey. John Barnes, Gordon Van Gelder, Robert Forward, Gail Butler, Larry Warner |
| OryCon 23 | November 9-11, 2001 | Melanie Rawn, Laura Anne Gilman, Real Musgrave, Steve Macdonald |
| OryCon 24 | November 22-24, 2002 | Susan R. Matthews, Lee Seed, Martin H. Greenberg |
| OryCon 25 | November 14-16, 2003 | Nina Kiriki Hoffman (Author), Ken Goddard (Science), Toni Weisskopf (Editor), Martin Greenberg (Special Editor), Gail Butler (Artist), (Friends of Filk Guest): Uffington Horse |
| OryCon 26 | November 5-7, 2004 | Jerry Oltion (Author), Jennifer Heddle (Editor), Mark Roland (Artist) |
| OryCon 27 | November 4-6, 2005 | Brian Herbert & Kevin J. Anderson (Author), Paul Guinan (Artist), Tom Smith (Filk), Rebecca Moesta & Anina Bennett (Special Guests) |
| OryCon 28 | November 17-19, 2006 | Cory Doctorow (Writer), Ellen Datlow (Editor), Vincent Di Fate (Artist) |
| OryCon 29 | November 17-19, 2007 | Robert Charles Wilson (Writer), Liz Scheier (Editor), Molly Harrison (Artist), Peter S. Beagle (Friends of Filk), Jonas Saunders (Fan) |
| OryCon 30 | November 21-23, 2008 | Harry Turtledove (Writer), Ginjer Buchanan (Editor), Jeff Fennel (Artist), Tricky Pixie (Filk), Cecilia Eng (Fan) |
| OryCon 31 | November 27-29, 2009 | Patricia Briggs, Lou Anders, Lubov, Jeff Hitchin, Chris Lester |
| OryCon 32 | November 12-14, 2010 | P. N. Elrod (Writer), Sharyn November (Editor), Chad Savage (Artist), Seanan McGuire (Filk) |
| OryCon 33 | November 11-13, 2011 | E. E. Knight (Writer), Scott Allie (Editor), Jim Pavelec (Artist) |
| OryCon 34 | November 2-4, 2012 | Mike Shepherd (Writer), Jess Hartley (Editor), Vance Kovacs (Artist), Michael Longcor (Filk) |
| OryCon 35 | November 8-10, 2013 | Anne Bishop, Larry Elmore, Jay Lake, Liz Gorinsky, Matt Vancil, Debs and Errol |
| OryCon 36 | November 7-9, 2014 | William F. Nolan, Mark Roland, Vixy & Tony, Jason Andrew, Jesse Lagers, Jay Lake |
| OryCon 37 | November 20-22, 2015 | Alan M. Clark, Tanya Huff, Ryan Wells, Jason V. Brock, PDX Broadsides |
| OryCon 38 | November 18-20, 2016 | David Weber, David Mattingly, Diana Gill, Mark Osier, Leslie Hudson |
| OryCon 39 | November 17-18, 2017 | Timothy Zahn, Briana Lawrence, Jessica Walsh, David Boop, Sarah Clemens |
| OryCon 40 | November 9-11, 2018 | |
| OryCon 41 | November 8-10, 2019 | Rob Carlos, Susan Chang, C. J. Cherryh, Fonda Lee, Dragon Dronet, Cecilia Eng |
| OR-eCon | November 12-14, 2020 | |
| OryCon 42 | November 13-15, 2021 | Phil and Kaja Foglio, A. Lee Martinez |
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