Marshall Edward Newhouse (born September 29, 1988) is an American former professional football offensive tackle.

He was selected by the Green Bay Packers in the fifth round of the 2010 NFL draft and later won Super Bowl XLV with them over the Pittsburgh Steelers.

Newhouse was also a member of the Cincinnati Bengals, New York Giants, Oakland Raiders, Buffalo Bills, Carolina Panthers, New Orleans Saints, New England Patriots, and Tennessee Titans.

Originally from Dallas, Texas, Newhouse attended Lake Highlands High School where he was a two-year letterman in football.

Newhouse also lettered in weightlifting, where he competed in powerlifting and earned a third-place finish in the 2005 state championships.

He made his collegiate debut in the season-opening 17–7 win at Baylor where he recorded a knockdown block in that contest.

His senior year, he was first-team All-Mountain West Conference, leading him to be invited to the NFL Combine and to play in the East-West Shrine Game.

On September 25, 2018, Newhouse was traded to the Carolina Panthers for a conditional 2021 seventh-round draft pick, used to select Jack Anderson.