W Marvin Watson
- Category : 1924-births
- Type : PE
- Profile : 5/1 - Heretical / Investigator
- Definition : Single
- Incarnation Cross : LAX Separation 1
American Democratic politician who served as advisor to U.S. President Lyndon B. Johnson from 1965 to 1968 and as Postmaster General from 1968 to 1969.
With Sherwin Markman, he published the book Chief of Staff: Lyndon Johnson and His Presidency in 2004. Watson died on 26 November 2017 at the age of 93 in The Woodlands, Texas.