The Hudson Armory is a former Massachusetts Army National Guard armory. It was built at the intersection of Park Street and Washington Street in Hudson, Massachusetts, next to the Assabet River in 1910 for the Massachusetts Volunteer Militia. It was designed by architects of Boston, who also designed Fenway Park. At some time prior to 2019, the armory was inactivated as a military facility, acquired by the Commonwealth of Massachusetts, and used for police and firefighter training. In March 2019 the armory's future was unclear, except that the Commonwealth planned to pull out of the facility on 30 June, and the Town of Hudson was considering purchasing the property.