John Rhys Coiro (born March 12, 1979) is an American film, television and stage actor who got his start on Broadway but is best known for his on-screen roles.

In 2016, Coiro traveled to Standing Rock, North Dakota to take part in the peaceful protest against the North Dakota Access Pipeline.

Coiro shared a studio space in Historic Filipino town with then-unknown Painter Jonas Wood. During this period, Coiro formed an underground, traditional Irish music band with artists Matt Johnson and Greg Santos, that played around East LA. In ’07, following the birth of his first child, Coiro accepted the role of Sean Hillinger on the 7th season of 24. Coiro was cast in The Last House On The Left but had to pull out when the writer’s strike abruptly ended and production resumed on 24. The role ended up being given to Aaron Paul. In ’09 Coiro returned to the stage, starring in a production of Howard Korder’s “Boy’s Life” at Second Stage in New York opposite Jason Biggs. In ’10 Coiro starred in Slamdance Winner Snow and Ashes and in '11 appeared alongside Alexander Skarsard in Screen Gems’ remake of Straw Dogs. In ’14, Coiro was antagonist to Stevie Van Zandt’s character on the final season of Netflix’s first original series, the Norwegian mega-hit Lillyhammer and he played one of the original Texas Rangers in The History Channel’s Mini-series Texas Rising, alongside Ray Liotta, Bill Paxton and Brendan Fraser. During this show he honed his riding and roping skills. In ’15 Coiro played Armenian gangster Ari Adamian on the final season of USA's Graceland.