Michael John McKean (born October 17, 1947) is an American actor, comedian, writer, composer and musician well known for his portrayal of Squiggy's friend, Leonard "Lenny" Kosnowski, on the sitcom Laverne & Shirley; and for his work in the Christopher Guest ensemble films, particularly as David St. Hubbins, the lead vocalist and rhythm guitarist of the fictional rock band Spinal Tap from the film This Is Spinal Tap.

His Disney roles include Lo-Fi and Mean Thumb in Teamo Supremo, Sarousch in The Hunchback of Notre Dame II, Mr. Bream in the two-part Recess episode "Yes, Mikey, Santa Does Shave", Jasper Badun in 101 Dalmatians: The Series, Cecil in Jungle Cubs, Peter Randall in the 1997 remake of That Darn Cat!, Ansel, Officer Bettelheim, Bryant, Dr. Herder, Guy in Lab Coat, Hank, Inspector, Kyle, Les, Mr. Myman and Parish in Dinosaurs, Harvey Cooper in the Touchstone Pictures film True Identity, Pauline in Jack, Mr. Locks in Goldie & Bear, Mr. Walsh in the 1999 Hollywood Pictures film Mystery, Alaska and Jason Starr and Warren Starbinder in the Disney Sunday Movie episode "Double Agent".