Ernie Grunwald (born 1970) is a Canadian actor who has made guest appearances in a number of notable television series.

Career
Grunwald has had recurring roles on One on One, The Suite Life of Zack & Cody (as Mr. Forgess), and Two of a Kind opposite Mary-Kate and Ashley Olsen. He has also guest starred on Friends, My Name Is Earl, NYPD Blue, Reno 911!, A.N.T. Farm, Walker, Texas Ranger, Supernatural, Grey's Anatomy, Two and a Half Men, Bones, The Mentalist, Weeds, and many other series. He guest starred as a restaurant manager in Monk ("Mr. Monk's 100th Case") and as a courier that lost a cooler containing a deadly virus in Psych ("Death is in the Air"). He also appeared as Walter in the Disney Channel Original Movie Good Luck Charlie, It's Christmas! in 2011.

He also made a cameo appearance in the 1992 Disney film The Mighty Ducks as a fan. He has also had roles in the feature films Cellular, It Takes Two, Men in Black II, and Stealing Harvard. Grunwald starred with Jason Priestley in Call Me Fitz.