Samuel or Sam Martin may refer to:
- Samuel Martin (planter) (1694–1776), planter and politician in Antigua
- Samuel Martin (Secretary to the Treasury) (1714–1788), British politician and administrator
- Sir Samuel Martin (politician) (1801–1883), Anglo-Irish politician and judge
- Samuel Martin (writer) (1810–1848), New Zealand land claimant, magistrate, journalist and writer
- Samuel Martin (entrepreneur) (born 1984), British entrepreneur
- Samuel E. Martin (1924–2009), linguist (Korean and Japanese) and designer of the Yale Romanization for Korean
- Samuel Soler Martín (born 1979), Paralympic swimmer from Spain
- Sam Martin (singer) (born 1983), American singer and songwriter
- Sam Martin (speedway rider) (born 1989), Australian speedway rider
- Sam Martin (American football) (born 1990), American football player
- Sam Martin, lead singer of the band Youngblood Hawke