Whitman Blount Mayo Jr. (November 15, 1930 – May 22, 2001) was an American actor, best known for his role as Grady Wilson on the 1970s television sitcom Sanford and Son.

He held many jobs to support himself and his family, including waiting tables, working in vineyards and as a probation officer.

In the early 1970s, while working for the New Lafayette Theatre, Norman Lear offered Mayo a role as Grady Wilson on Sanford and Son.

Mayo later starred in Grady, an unsuccessful spin-off in which his character moved in with his daughter and her husband in Beverly Hills.

Also in the late 1970s, Mayo appeared on the Los Angeles children's television program That's Cat, offering sage advice in a sweet manner to the main character Alice.

In 1991, he appeared in an episode of Full House titled "The Volunteer"; he played an old man named Eddie Johnson with Alzheimer's.

Mayo made several film appearances, including The Main Event with Barbra Streisand, D.C. Cab, Boyz n the Hood, and Waterproof with Burt Reynolds.