Robert Allen Nen (born November 28, 1969) is a former Major League Baseball right-handed relief pitcher. He spent most of his career as a closer. He is the son of former major league first baseman Dick Nen. He currently works in the Giants' front office as a special assistant to General Manager Brian Sabean.

Nen is best known for his years with the San Francisco Giants (1998–2002), with whom he was a three-time All-Star and played in the 2002 World Series. He also played with the Texas Rangers (1993) and Florida Marlins (1993–97); in 1997, Nen won the World Series championship with the Marlins.

Nen has 314 career saves with the Marlins (1993–1997; 108 saves) and Giants (1998–2002; 206 saves). He is 15th overall in career saves.

Nen wore number 31 as his jersey number throughout his career.

He attended Los Alamitos High School and played both varsity football and baseball with future Giants teammate J. T. Snow. Nen played mostly at third base, and also did some pitching. He skipped college and went directly to the minor leagues.

Nen was selected by the Rangers as a pitcher in the 32nd round of the 1987 MLB draft. The Rangers promoted him to their Major League roster in 1993. His partial season with the Rangers was marred by injuries and subpar results on the mound, resulting in a 6.35 earned run average.

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