Greg may refer to:

  • Greg (comics), the pen name of Belgian comic book artist Michel Regnier
  • Greg B. Abbott (1950), American businessperson, investor, entrepreneur and novelist
  • Greg Camarillo, American football player with the Minnesota Vikings
  • Greg Graffin, American punk rock musician, college professor, and author
  • Greg Hoard, American journalist and sports commentator
  • Gregg (surname), origin and list of people with the surnames Greg and Gregg
People in fiction
  • Dharma & Greg, an ABC situation comedy, starring Jenna Elfman and Thomas Gibson
  • Greg the Bunny, puppet in a FOX situation comedy of the same name
  • Greg Flemming, character in the webcomic User Friendly
  • Greg House, protagonist of the FOX series, House, played by Hugh Laurie
  • Greg Sanders, character in the CBS series CSI: Crime Scene Investigation, played by Eric Szmanda
  • Greg Brady (Brady Bunch), character in The Brady Bunch, a popular 1970s TV show, played by Barry Williams
  • Greg Heffley, protagonist of Diary of a Wimpy Kid
  • Greg Warner, character in the CBS series yes, dear, played by Anthony Clark