Lucas Bradley (1809–1889) was an American architect in Racine, Wisconsin. He designed the Eli R. Cooley House in Racine, Wisconsin, the John Collins House, George Murray House (Racine, Wisconsin) and Racine College.
Bradley was born in Geneva, New York. He apprenticed at Auburn, New York, lived in St. Louis and then moved to Racine in 1843. He is known for designing the Second Presbyterian Church of St. Louis and the First Presbyterian Church in Racine, notable examples of Greek Revival architecture.
He died at his home in Racine.