John Whitin Lasell Jr. (November 6, 1928 – October 4, 2024) was an American film and television actor.

[3] He was known for playing parapsychologist Dr. Peter Guthrie in the American soap opera television series Dark Shadows.

Lasell played John Wilkes Booth in the anthology television series The Twilight Zone in the episode "Back There".

[7] He played the recurring roles of Dr. Robbins in Lassie and Benjamin Wedlock in the drama television series Dan August, and made three appearances in the legal drama television series Perry Mason.

[8] Lasell guest-starred in numerous television programs including Gunsmoke (S7E3 as outlaw Tucker Ferrin in the episode “Miss Kitty”), Wagon Train, Rawhide, Tales of Wells Fargo, 12 O'Clock High, The Fugitive, Adam-12, Mannix, Ben Casey, The Streets of San Francisco and Shotgun Slade.