Greg
- Birthday: 1931-05-05
- Deathday: 1999-10-29
- Place of birth: Ixelles, Belgium
- Also know as: Michel Régnier
Michel Régnier (5 May 1931 – 29 October 1999), credited by his pseudonym Greg, was a Belgian cartoonist best known for Achille Talon, and later became editor of Tintin magazine.
