William B. Colleary, AIA, (September 26, 1890 – August 18, 1973) was an American architect active in the first half of the twentieth century. He practiced in Boston, Massachusetts, and was a partner in the architectural firm of Sheehan & Colleary and later William B. Colleary, both of which were responsible for the design of many Roman Catholic Church churches, schools, rectories, and convents.