Martin Klein

Martin Klein may refer to:

• Martin Klein (footballer) (born 1984), Czech international footballer
• Martin Klein (wrestler) (1884–1947), Estonian wrestler
• Martin Klein (engineer) (born 1941), American engineer and inventor
• Martin A. Klein, historian of the Atlantic slave trade
• Martin J. Klein (1924–2009), American science historian
• R. Martin Klein (born 1947), American voice actor
• Marty Klein, art professor