Michael Welch or Michael Alan Welch (born July 25, 1987) is an American actor. He has portrayed the roles of Luke Girardi on the TV series Joan of Arcadia and Mike Newton in the 2008 film Twilight and its sequels New Moon and Eclipse.
Welch appeared in the 1998 film Star Trek: Insurrection, as well as on the television series Malcolm in the Middle, The X-Files, 7th Heaven, Cold Case, Without a Trace, NCIS, Crossing Jordan, The Riches, and Birds of Prey. He also narrated the Carl Hiaasen book, Flush, for CD in 2006. One of his most acclaimed roles is as a teenage version of Colonel Jack O'Neill (Young Jack O'Neill) in the Stargate SG-1 episode "Fragile Balance". In 2008, Welch played Mike Newton in the film Twilight, based on the book by Stephenie Meyer. He reprised the role in the film's 2009 sequel, New Moon. He stars also in the Indie thriller Unrequited under the direction from Jason Epperson.