The 1974 United States Senate election in Indiana took place on November 5, 1974. Incumbent Democratic U.S. Senator Birch Bayh was re-elected to a third consecutive term in office, defeating Mayor of Indianapolis Richard Lugar.
Lugar would later win the state's other Senate seat in 1976 and would serve alongside Bayh until the latter's defeat in 1980. He would also serve alongside Birch's son Evan from 1999 from 2011.