Peter Martyn
Peter Martyn may refer to:
- Peter Martyn (soldier) (1772–1827), Irish soldier
 - Peter Martyn (actor) (1925–1955), British actor
 - Peter Martyn (judge), Irish barrister, landowner and judge
 - Peter Martyn (MP), Member of Parliament (MP) for Helston
 - Peter H. Martyn (born 1948), Canadian journalist