The 1980 United States Senate election in Arizona took place on November 4, 1980. Incumbent Republican Senator
Barry Goldwater decided to run for reelection to a third consecutive term, after returning to the Senate in
1968 following his
failed presidential run in 1964 against
Lyndon B. Johnson. Despite Republican presidential nominee
Ronald Reagan's
landslide win in Arizona, Goldwater defeated Democratic Party nominee Bill Schulz in the general election by a narrow margin, which later caused Goldwater to decide against running for reelection to a fourth consecutive term. Goldwater won only three counties, including
Maricopa County.