Robert L. Rock, American businessman and politician, 42nd Lieutenant Governor of Indiana (born 1927)

Robert L. Rock was an American politician who served as the Lieutenant Governor of Indiana from 1965 to 1969 and as the Mayor of Anderson, Indiana, from 1972 to 1980. He was the Democratic nominee for Governor of Indiana in 1968, but lost to Republican Edgar Whitcomb.

The lieutenant governor of Indiana is a constitutional office in the US state of Indiana. Republican Micah Beckwith, who assumed office January 13, 2025, is the incumbent. The office holder's constitutional roles are to serve as the president of the Indiana Senate, become acting governor during the incapacity of the governor, and become governor should the incumbent governor resign, die in office, or be impeached and removed from office. Lieutenant governors have succeeded ten governors following their deaths or resignations. The lieutenant governor holds statutory positions, serving as the head of the state agricultural and rural affairs bureaus, and as the chairman of several state committees.