The 1976 United States presidential election in South Dakota was held on November 2, 1976 as part of the 1976 United States presidential election. Incumbent President Gerald Ford won the state of South Dakota, defeating Democratic candidate Jimmy Carter by a slim margin of 1.48%. Ford won all four of the state's electoral votes, but lost the national election to Carter.

The 2020 United States presidential election in South Dakota was held on Tuesday, November 3, 2020, as part of the 2020 United States presidential election in which all 50 states plus the District of Columbia participated. South Dakota voters chose electors to represent them in the Electoral College via a popular vote, pitting the Republican Party's nominee, incumbent President Donald Trump, and running mate Vice President Mike Pence against Democratic Party nominee, former Vice President Joe Biden, and his running mate California Senator Kamala Harris. South Dakota has three electoral votes in the Electoral College.