- 4 A Greaves
- 3 A-AlkazeX-X
- 2 A. Karenovics (Orig. id Software)
- 5 A.C [T4(_)ruS] ARANDA
- 4 A.R.A. - sHk|+evergreen+
- 3 A4 with permission & assistance of Dawn Knight
- 9 a_z
- 25 Aahz
- 15 Aalexanderrr
- 2 Aaron
- 2 Aaron "Ha|o" Preabt
- 4 Aaron "Hedge-O-Matic" Starr
- 14 Aaron "Platinum" Ingersoll
- 2 Aaron "The Chuft" Proctor
- 3 Aaron 'Lastie' Last
- 2 Aaron *LoS* Maly
- 3 Aaron Beane
- 4 Aaron Leitch (OmletteDuFromage=AD=)
- 3 Aaron Leitch (OmletteDuFromage=AD=) and Steve Kinney
- 3 Aaron McCoy
- 7 Aberiu
- 3 ABS_Magnitude
- 8 Absolon Absolon_
- 6 Absolon_
- 2 Absolute
- 3 Accurain
- 2 Ace08
- 3 Achilles
- 2 achromatic
- 3 Acid (~A~)
- 2 Acid_Kid
- 3 aCruceSalus
- 2 Action-Force
- 23 Action-Force© Studios
- 2 AC|D
- 3 Adam "MachDelta" Weinhandl
- 6 Adam "Oblivion_Soldier" Sims
- 2 Adam 'avatar' J
- 2 Adam 'Duffman' Boulton
- 2 Adam 'Muad'dib' Stiles
- 2 Adam <Elroy> Mazzitelli
- 2 Adam Alpern
- 2 Adam Coggin (FrameR-A-T-E)
- 6 Adam Essary
- 2 Adam Henderson
- 2 Adam L. Hughes
- 2 Adam Lohr
- 8 Adam Stiles (Muad'dib)
- 3 Adam Willis
- 27 ADES
- 2 Adrian Dixon
- 2 Adrian Lopresto
- 3 Adrian Samkian
- 3 Aftermass[TJL1]
- 23 Agent Scully
- 2 AgentSmith and Migielio
- 2 Agnew Adam
- 2 Agony Clawfist / AgonyXL subz`
- 2 Air Head
- 3 Akiya
- 2 aK{SAP}