Seamus McGarvey, ASC, BSC (born 29 June 1967) is a cinematographer from Armagh, Northern Ireland. He lives in Tuscany, Italy. He has received two Academy Award nominations for his cinematography, on Joe Wright's 2007 drama Atonement and his 2012 adaptation of Leo Tolstoy's novel Anna Karenina.

In addition to the Oscar nominations, McGarvey won the British Society of Cinematographers (B.S.C.) award for Anna Karenina and for Nocturnal Animals, as well as a nomination for Atonement, and earned BAFTA noms for Atonement, Anna Karenina and Nocturnal Animals. He received A.S.C. nods for Atonement and Anna Karenina. Atonement earned him nominations for the British Independent Film Award, the Chicago Film Critics Association and the Online Film Critics Society, and he received the top honor from the Phoenix Film Critics Society.