Michael Cronin is an English actor who has portrayed the character of Geoffrey of Monmouth in twelve episodes of the BBC series, Merlin.
- A Remedy to Cure All Ills
- Beauty and the Beast: Part One
- Beauty and the Beast: Part Two
- The Sins of the Father
- Goblin's Gold
- The Changeling
- Love in the Time of Dragons
- The Coming of Arthur: Part One (cameo)
- The Darkest Hour: Part Two
- The Wicked Day (cameo)
While playing Geoffrey, Cronin wore fake eyebrows.