The Union Church is an historic church and local history museum owned by the Portsmouth Historical Society at 870 East Main Road at Union Street in Portsmouth, Rhode Island.

One exhibit room is dedicated to Julia Ward Howe and includes a collection of furniture from her summer home in Portsmouth and a display about her life.

The last worship service was held in 1937 and then it was declared a defunct organization by the Superior Court in 1940 with the fourteen remaining members voting to donate the property to the Portsmouth Historical Society.

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