Moon Knight apears in a very limited amount of videogames.
If I mised something, I'l be glad to know it.
Spider-man: Web of Shadows (NPC character, fights upon your side, appears in cutscenes) :
Marvel Ultimate Alliance (mod for PC, playable for PS3 Xbox 360, playable through a glitch for PS2 and Xbox) :
Marvel Pinball (Has his personal Pinball table) :
Marvel Avengers Alliance (In future, a "recruitable" hero) :
Marvel VS Capcom 3 (Appears in Hawkeye's ending) :
DC Universe Online (not an oficial character, posible to make however) :
Lego Marvel Super Heroes (an unlockable playable character):
Marvel Heroes (a playable character):