Germán Rivera Díaz (born July 6, 1960) is a Puerto Rican former professional baseball third baseman.

He played for the Los Angeles Dodgers and Houston Astros of Major League Baseball (MLB) in the 1980s.

Rivera was signed as an undrafted free agent by the Los Angeles Dodgers on December 20, 1977.

He was the Dodgers opening day starter at third base in 1984, playing in 94 games that season and finishing with a .260 batting average.

On July 15, 1985 he was traded to the Houston Astros (with Rafael Montalvo) in exchange for Enos Cabell.