The 2020 Massachusetts Democratic presidential primary took place on March 3, 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 Massachusetts primary was a semi-closed primary, with the state awarding 114 delegates towards the 2020 Democratic National Convention, of which 91 were pledged delegates allocated on the basis of the results 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.