The 2020 Texas Democratic presidential primary took place on March 3, 2020, as one of 15 contests scheduled on Super Tuesday in the Democratic Party primaries for the 2020 presidential election, following the South Carolina primary the weekend before. The Texas primary was an open primary, with the state awarding the second-largest amount of national convention delegates on Super Tuesday and third-largest amount overall: 260 delegates, of which 228 were pledged delegates allocated on the basis of the primary.

Super Tuesday is the United States presidential primary election day in February or March when the greatest number of U.S. states hold primary elections and caucuses. Approximately one-third of all delegates to the presidential nominating conventions can be won on Super Tuesday, more than on any other day. The results on Super Tuesday are therefore a strong indicator of the likely eventual presidential nominee of each political party.