Derrel McKinley "Bud" Harrelson was an American professional baseball shortstop, coach and manager. He played for the New York Mets, Philadelphia Phillies and Texas Rangers from 1965 to 1980. After his retirement as a player, he served as a coach for the 1986 Mets team that won the World Series, and as manager of the Mets in 1990 and 1991. He was a coach and part-owner of the Long Island Ducks of the Atlantic League of Professional Baseball.

The following are the baseball events of the year 1980 throughout the world.