First Baptist Church and Cook Memorial Building is a historic Baptist church located at Carthage in Jefferson County, New York. The church was built in 1885 and is a vernacular Gothic / Romanesque Revival–style edifice. It is of brick with stone trim and features asymmetrical massing, a multi-story bell tower, broad cross gables, corbelled brick cornices, stone-capped brick buttresses, and lencet-arched stained glass windows. The Cook Memorial Building dates to the 1860s-1870s and is a two-story brick dwelling with a variety of Italianate style and late Victorian eclectic features. It was listed on the National Register of Historic Places in 2005.