Hudson is a town located in Middlesex County, Massachusetts. It was first settled in 1699 and was officially incorporated in 1866.
According to the United States Census Bureau, the town has a total area of 30.7 km² (11.8 mi²). 29.8 km² (11.5 mi²) of it is land and 0.9 km² (0.3 mi²) of it is water. The total area is 2.87% water.