| Election Name: | 1980 United States Senate election in Illinois |
| Country: | Illinois |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1974 United States Senate election in Illinois |
| Previous Year: | 1974 |
| Next Election: | 1986 United States Senate election in Illinois |
| Next Year: | 1986 |
| Election Date: | November 4, 1980 |
| Image1: | Alan Dixon (3x4a).jpg |
| Nominee1: | Alan Dixon |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 2,565,302 |
| Percentage1: | 56.01% |
| Nominee2: | Dave O'Neal |
| Party2: | Republican Party (United States) |
| Popular Vote2: | 1,946,296 |
| Percentage2: | 42.50% |
| Map Size: | 300x300px |
| U.S. Senator | |
| Before Election: | Adlai Stevenson III |
| Before Party: | Democratic Party (United States) |
| After Election: | Alan J. Dixon |
| After Party: | Democratic Party (United States) |
| Turnout: | 73.51% |
The 1980 United States Senate election in Illinois was held on November 4, 1980. Incumbent Democrat U.S. Senator Adlai Stevenson III decided to retire. Democrat Alan J. Dixon won the open seat.
The primaries and general elections coincided with those for other federal offices (President and House), as well as those for state offices.
Incumbent Democrat Adlai Stevenson III opted not to seek reelection to a third-term. This was the first open-race for this senate seat since 1938.
Turnout in the primary elections was 35.36%, with a total of 2,026,814 votes cast.[1] [2]
Turnout during the general election was 73.51%, with 4,579,933 votes cast.[3] [2]
Alan J. Dixon overwhelmingly won the Democratic primary.
Alex Seith, who had won the Democratic nomination for Senator two years earlier, almost winning the 1978 race in what would have been a major upset, laid hopes of capturing the nomination again.
Anthony R. Martin-Trigona, a political activist who had unsuccessfully sought the nomination for senate in 1978, again ran for the nomination.
Robert Ash "Bob" Wallace made use of his friendship with boxer Muhammad Ali, featuring him in campaign ads and having him make campaign appearances.[5] [6]
Dakin Williams was a prosecutor, and was the younger brother of famous playwright Tennessee Williams.[7] He had been a candidate for the Democratic nomination of Illinois' other US Senate seat in 1972, and had unsuccessfully sought the nomination for this seat in 1974. He had also been a candidate for governor in 1978.[4]