Russell Wayne Harvard (born April 16, 1981) is an American actor. He made his feature film debut in Paul Thomas Anderson's There Will Be Blood (2007), playing opposite Daniel Day-Lewis as his adopted son, H.W. Plainview.

In the 2010 biopic The Hammer, he portrayed deaf NCAA championship wrestler and UFC mixed martial arts fighter Matt Hamill. Harvard also won acclaim Off Broadway in 2012 as Billy, the deaf son in an intellectual, though dysfunctional, hearing British family, in Tribes by Nina Raine. For his interpretation, he won a 2012 Theatre World Award for Outstanding Debut Performance and nominations for Drama League, Outer Critics Circle and Lucille Lortel Awards for Outstanding Lead Actor.

He played Mr. Wrench in the first and third seasons of the television series Fargo.