Fred Armisen, impersonating U.S. President Barack Obama on Saturday Night Live in 2008 and 2009

Dan Aykroyd, in Trading Places (1983)

Johnny Carson, in a 1976 The Tonight Show sketch

Billy Crystal at the 84th Academy Awards.

Ted Danson, at a 1993 Friars Club roast of his then-girlfriend Whoopi Goldberg

Robert Downey Jr. in Tropic Thunder (2008)

Benny Hill, impersonating Idi Amin, Mr. T, and in a 1981 sketch spoofing Roots

Raul Julia, in the Shakespeare in the Park productions of Othello in 1979 and 1991

Larry Kert, in the play Jolson Tonight (197980)

Jimmy Kimmel, impersonating Karl Malone and Oprah Winfrey on The Man Show

Marcello Mastroianni, in Miss Arizona (1987)

David Niven, in Old Dracula (1974)

Carroll O'Connor, in a 1975 episode of All in the Family

Pat Paulsen, in a 1974 guest spot on The Merv Griffin Show and Night Patrol (1984)

Fred Travalena, impersonating Eddie Murphy on Live with Regis and Kathie Lee, and Michael Jackson at the 1992 MTV Video Music Awards

Jim Varney, in Ernest Goes to Africa (1997)

Gene Wilder, in Silver Streak (1976)

Flip Wilson, in the 1980 TV special Uptown: A Tribute to the Apollo Theater

For a more complete list feel free to peruse:

https://en.wikipedia.org/wiki/List_of_entertainers_who_performed_in_blackface