Noël Antony Miller Greig (25 December 1944 – 9 September 2009) was a British playwright most noted for his work in radical gay theatre. Greig wrote over 50 plays, as well as directed and produced numerous companies in both the United Kingdom and around the world.

One of the hallmarks of Greig's plays is there demonstration of gay liberation themes, with characters who choose to actively assert their gay identities. John M. Clum notes that the gay characters in Greig's As Time Goes By "move...from acquiescence of their status as outsiders or criminals to militant assertion of their gay identity, the beginning of gay liberation".