Kawaiahaʻo Church is a historic Congregational church located in Downtown Honolulu on the Hawaiian Island of Oʻahu. The church, along with the Mission Houses, comprise the Hawaiian Mission Houses Historic Site, which was designated a U.S. National Historic Landmark (NHL) in 1962. In 1966 it and all other NHLs were included in the first issuance of the National Register of Historic Places.