Leonard King Lesser (December 3, 1922 – February 16, 2011) was an American character actor and comedian best known for his recurring role as Uncle Leo on Seinfeld.

[2] Lesser enlisted in the United States Army the day after the attack on Pearl Harbor, and served in the China Burma India Theater during World War II.

He appeared on American television steadily since 1955 on programs such as That Girl, The Untouchables, Peter Gunn, Have Gun - Will Travel, Mr. Lucky, The Outer Limits, Alfred Hitchcock Presents, Gunsmoke, Kentucky Jones, Green Acres, Get Smart, Bat Masterson, Family Affair, The Monkees, Quincy, M.E., The Rockford Files, The Amazing Spider-Man, Mad About You, All in the Family, Boy Meets World, Smart Guy, My Favorite Martian, The Munsters, and Castle.

He appeared in a variety of films such as Birdman of Alcatraz (1962), How to Stuff a Wild Bikini (1965), Kelly's Heroes (1970), Blood and Lace (1971), Dirty Little Billy (1972), Papillon (1973), Truck Stop Women (1974), The Outlaw Josey Wales (1976), Supervan (1977), Moonshine County Express (1977), Ruby (1977), Death Hunt (1981), Take This Job and Shove It (1981), Grandmother's House (1988) and Baadasssss!

Tonight was the opening of Gigi at my beloved Reprise Theater Company and I've only returned at this late hour to hear the news.