The First Congregational Church of Boscawen is a historic church on King Street in Boscawen, New Hampshire. Built in 1799, the wood frame church was significantly altered in 1839, when it acquired its present Greek Revival character. Its front facade is modeled as a Greek temple, with corner pilasters supporting an entablature consisting of an architrave, plain frieze, and moulded cornice. This entablature is continued around the two sides of the building. The church tower rises from the center of the front facade, and consists of three stages: the first stage is an enclosed square with a single small window in its rear face, the second is an open belfry surrounded by pilastered supports, to which the octagonal steeple is mounted.