Robert Lowell Heise (born May 12, 1947) is a former professional baseball player. He played all or part of 11 seasons in Major League Baseball for the New York Mets (1967–69), San Francisco Giants (1970–71), Milwaukee Brewers (1971–73), St. Louis Cardinals (1974), California Angels (1974), Boston Red Sox (1975–76) and Kansas City Royals (1977). A utility infielder, Heise played 174 games at shortstop, 154 at second base, and 135 at third base.
Heise was a member of four teams that made the postseason, but he never played in the postseason himself. He appeared in four games during a September call-up for the "Miracle Mets" who won the 1969 World Series. He played briefly for the National League West-winning Giants in 1971 before being traded to the Brewers on June 1 for pitcher Floyd Wicker. In 1975, he was one of the reserve infielders on the Red Sox team that won the 1975 American League pennant, but he did not appear in the ALCS or World Series. In his final major league season, he was a member of the American League West champion Royals, but he did not play against the Yankees in the ALCS. He was also a teammate of no fewer than 14 Hall of Famers. They were: Tom Seaver, Nolan Ryan, Juan Marichal, Willie Mays, Willie McCovey, Gaylord Perry, Lou Brock, Frank Robinson, Carlton Fisk, Jim Rice, Carl Yastrzemski, Ferguson Jenkins, and George Brett.
In 11 seasons, Heise played in 499 games and had 1,144 career at bats. He scored 104 runs, and tallied 283 hits, 43 doubles, three triples, one home run, 86 RBI, three stolen bases and 47 walks. He hit his only home run on June 30, 1970 while playing for the San Francisco Giants. The game was against the San Diego Padres, at Candlestick Park in San Francisco, and he hit his home run in the last of the third inning against pitcher Danny Coombs. No one was on base. When he hit the home run, Hall of Famer Willie Mays was on deck. The Padres eventually won the game by a score of three to two. He had a career .247 batting average, .280 on-base percentage, and a .293 slugging percentage. He tallied 335 total bases, 30 sacrifice hits, five sacrifice flies and three intentional walks.