Nigel John Dermot “Sam” Neill DCNZM OBE (born 14 September 1947) is a New Zealand actor, director, producer, and writer.

Born in Omagh, Northern Ireland, Neill moved to Christchurch, New Zealand, with his family in 1954. He first achieved recognition with his appearance in the 1977 film Sleeping Dogs, which he followed with leading roles in My Brilliant Career (1979), Omen III: The Final Conflict, Possession (both 1981), A Cry in the Dark (1988), Dead Calm (1989), The Hunt For Red October (1990), and The Piano (1993). He came to international prominence as Dr. Alan Grant in Jurassic Park (1993), a role that he reprises in Jurassic Park III (2001) and the upcoming Jurassic World: Dominion (2022).

Outside of film, Neill has appeared in numerous television series, including Reilly, Ace of Spies (1983), The Simpsons (1994), Merlin (1998), The Tudors (2007), Crusoe (2008–2010), Happy Town (2010), Alcatraz (2012), Peaky Blinders (2013–2014), and Rick and Morty (2019). He has presented and narrated several documentaries.

Neill is the recipient of the Longford Lyell Award and the New Zealand Film Award and also the Logie Award for Most Outstanding Actor. He has three Golden Globe and two Primetime Emmy Award nominations. He lives in Alexandra, New Zealand and has three children and one stepchild.