1980 Democratic Party presidential primaries

From January 21 to June 3, 1980, voters of the Democratic Party chose its nominee for president in the 1980 United States presidential election. Incumbent President Jimmy Carter was again selected as the nominee through a series of primary elections and caucuses, culminating in the 1980 Democratic National Convention, held from August 11 to 14, 1980, in New York City.

Carter faced a major primary challenger in Senator Ted Kennedy of Massachusetts, who won 12 contests and received more than seven million votes nationwide, enough for him to refuse to concede the nomination until the second day of the convention. This remains the last primary election in which an incumbent president's party nomination was still contested going into the convention.

Carter would be the last incumbent president to lose a primary in any contest until Joe Biden lost to Jason Palmer in the 2024 American Samoa Democratic presidential caucuses. For the Democrats in 1980, a then-record of 37 primary races were held.