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John Whitin Lasell Jr. (November 6, 1928 - October 4, 2024) was an American film and television actor, known for playing vampire hunter Dr. Peter Guthrie in the American soap opera television series Dark Shadows.

Falcon Crest
as Sam

Dan August: Once Is Never Enough
as Wedlock

Fear on Trial

Message to My Daughter
as Doctor

Barnaby Jones
as Mr. Smith

A Great American Tragedy

The Streets of San Francisco
as Clark

Deathmaster
as Sgt. Kelly

Lassie: Joyous Sound
as Dr. Robbins

Honky
as Archer Divine

The Harness
as Minister

The Organization
as Zach Mills

Night Gallery
as Colonel Hawes

The Psychiatrist: God Bless the Children
as Maxwell

Dan August
as Ben Wedlock

Suppose They Gave a War and Nobody Came?
as Dr. Hillery

Topaz
as State Department Official (uncredited)

The Mod Squad
as Clinton Farragut

Adam-12
as Tom Stark

Mannix
as Richard Averill

The Invaders
as Bob Ferrara

Mission: Impossible
as Winston Walding

The F.B.I.
as Murray Dalton

Flipper
as Dr. Rothwell

12 O'Clock High
as Col. Peter Thom

The Rogues
as George

My Favorite Martian
as Mr. Morgan

The Fugitive
as Michael Pryor

The Investigators

Hazel
as Officer Dietrich

87th Precinct
as Ted Boone

Route 66
as Dan

Checkmate
as Captain Bloch

The Tall Man
as Ben Jardine

Hong Kong
as Roger Dalman

Hawaiian Eye
as Alan Niles

The Twilight Zone
as Jonathan Wellington

One Step Beyond
as John Perkins

Rawhide
as Capt. Wayly

Naked City
as Sheldon

Perry Mason
as Danny Shine

Wagon Train
as Jed Polke

Gunsmoke
as Tucker

Lassie
as Dr. Robbins

General Electric Theater
as Dr. Ames