Massachusetts Republican Party

The Massachusetts Republican Party (MassGOP) is the Massachusetts branch of the U.S. Republican Party.

Originally, the party was formed in 1854. Soon after its founding, the party quickly became the dominant party in the state (previously it had been the Know-Nothing Party), with Massachusetts remaining a staunchly Republican state until well into the 20th century. In fact, every single Massachusetts state and federal office was held by a party member until 1876, and it was only until 1874 that the state had any Democratic mayors again (namely William Gaston of Boston).

By the 1920s, however, the Massachusetts Republican Party was in decline. Immigrants to Massachusetts made the state increasingly Democratic, as well as the Great Depression and the New Deal. The state began producing a streak of victories for Democratic presidential candidates beginning in 1928, and by the 1950s, the Massachusetts Republican Party's strongholds were reduced to rural Western Massachusetts and Cape Cod. Since then, however, the party has still had control over the governor's office from 1990 to 2023.

As of 2024, the Massachusetts Republican Party's members in office include two state legislative leaders, two members of the Massachusetts Senate, 25 members of the Massachusetts House of Representatives, and four mayors. There are no Republican congresspeople from the state.

In accordance with Massachusetts General Laws Chapter 52, the party is governed by a state committee which consists of one man and one woman from each of the 40 State Senate districts. The state committee elects party officers including a chair. The party currently has very weak electoral power in Massachusetts. It controls none of Massachusetts' statewide or federal elected offices, and holds just 14% of its state legislative seats.