Alamsyah is both a given name and a surname. Notable people with the name include:
Given name: Alamsyah Nasution (born 1981), Indonesian footballer Alamsyah Ratu Perwiranegara (1925–1998), Indonesian military officer and diplomat Alamsyah Yunus (born 1986), Indonesian badminton player
Surname: Donny Alamsyah (born 1978), Indonesian actor