The 2020 Louisiana Democratic presidential primary took place on July 11, 2020, a Saturday, in the Democratic Party primaries for the 2020 presidential election. It was originally planned for April 4 together with three other primaries, but was moved twice due to the COVID-19 pandemic. The Louisiana primary was a closed primary, with the state awarding 60 delegates, of which 54 were pledged delegates allocated on the basis of the results of the primary.

Presidential primaries and caucuses were organized by the Democratic Party to select the 3,979 pledged delegates to the 2020 Democratic National Convention held on August 17–20 to determine the party's nominee for president in the 2020 United States presidential election. The elections took place in all 50 U.S. states, the District of Columbia, five U.S. territories, and through Democrats Abroad, and occurred between February 3 and August 11.