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Michael Leonard Ontkean (born January 24, 1946) is a Canadian retired actor. Born and raised in Vancouver, British Columbia, Ontkean relocated to the United States to attend the University of New Hampshire on a hockey scholarship before pursuing a career in acting in the early 1970s. He initially came to prominence portraying Officer Willie Gillis on the crime drama series The Rookies from 1972 to 1974, followed by lead roles in the hockey sports comedy film Slap Shot (1977) and the romantic comedy Willie & Phil (1980). In 1982, he had a starring role opposite Harry Hamlin and Kate Jackson in the drama Making Love, in which he portrayed a married man who comes to terms with his homosexuality. Ontkean continued to appear in films, such as Clara's Heart (1988) and Postcards from the Edge (1990) before being cast as Sheriff Harry S. Truman on David Lynch's Twin Peaks (1990–1991), the role for which he is best known.

Twin Peaks: The Missing Pieces
as Sheriff Harry S. Truman

The Descendants
as Cousin Milo

North Shore

Mrs. Ashboro's Cat
as Wes Merritt

A Killing Spring
as Tom Keaton

Bear with Me
as Greg Bradley

Green Sails
as John Scott

Just a Little Harmless Sex
as Jeff

A Chance of Snow
as Matthew 'Matt' Parker

Summer of the Monkeys
as John Lee

Nico the Unicorn
as Tom Gentry

Swann
as Stephen

Psi Factor: Chronicles of the Paranormal

The Stepford Husbands
as Mick Davidson

The Man Next Door
as Eli Cooley

The Outer Limits
as Dr. Charles McCamber

Family Album
as Ward Thayer

Vendetta II: The New Mafia
as Hank Parnell
Whose Child Is This? The War for Baby Jessica
as Jan DeBoer

Rapture
as Jeff Lisker

Legacy of Lies

In a Child's Name
as Kenneth Taylor

In Defense of a Married Man
as Robert

Postcards from the Edge
as Robert Munch

Twin Peaks
as Harry S. Truman

Twin Peaks
as Sheriff Harry S. Truman

Cold Front
as Derek McKenzie

Bye Bye Blues
as Teddy Cooper

Clara's Heart
as Bill Hart

Maid to Order
as Nick McGuire

The Allnighter
as Mickey Leroi

Street Justice
as Curt Flynn

The Right of the People
as Christopher Wells

Kids Don't Tell
as John Ryan

Just the Way You Are
as Peter Nichols

The Blood of Others
as Jean

The Witching
as Frank Brandon

The Hitchhiker
as Gordon Brooks

Making Love
as Zach

Willie & Phil
as Willie Kaufman

Tales of the Unexpected
as Tommy

Voices
as Drew Rothman

US Against the World
as Self

Slap Shot
as Ned Braden

Necromancy
as Frank Brandon

The Rookies
as Willie Gillis

Hot Summer Week
as Will

Pickup on 101
as Chuck

The Rookies
as Willie Gillis

The Peace Killers
as Jeff

The Boy from Dead Man's Bayou

Great Performances
as Lucius Harney

The Partridge Family
as Lester Braddock

Ironside

Hawkeye and the Last of the Mohicans
as Cochea