The Massachusetts 3rd General Court District (or "3rd Middlesex") is an electoral district for the Massachusetts House of Representatives. Located in central Massachusetts, it comprises the towns of Hudson, Maynard and Stow (all of which are located in Middlesex County), as well as the town of Bolton (located in Worcester County). Democrat Kate Hogan of Stow has represented the district since 2013. She is running unopposed for re-election in the 2020 Massachusetts general election.