William H. "Bill" Wynn (1932 – February 21, 2002) was the first president of the United Food and Commercial Workers International Union (UFCW), and the last president of the Retail Clerks International Union (RCIU), after the latter merged with the Amalgamated Meat Cutters and Butcher Workmen of North America in 1979, to create the UFCW.

He is best known for playing a leading role in completing the above merger, and, through that effort, making a pivotal contribution to the creation of the largest union affiliated to the AFL–CIO at the time.

[1] Wynn became a union member himself in 1948 when, at the age of 15, he started working at The Great Atlantic & Pacific Tea Company, or A&P, superstore in his hometown of South Bend, Indiana.

Through Wynn's leadership the UFCW grew significantly – via new member organizing and mergers with other unions – and pioneered the use of television advertising as a tactic and medium for comprehensive campaign approaches.

[2] A vice-president of the AFL–CIO, Wynn chaired the labor federation's Organizing Committee, and served on the executive board of the A. Philip Randolph Institute.