Ware & Treganza was a leading American architectural firm in the intermountain west during the late 19th and early 20th century. It was a partnership of Walter E. Ware and Alberto O. Treganza and operated in Salt Lake City, Utah.
They designed civic buildings, churches and homes, many of which are in Prairie School style and are listed on the U.S. National Register of Historic Places. Ware & Treganza also offered training to many other architects including Taylor Woolley, Leslie S. Hodgson, and Georgious Y. Cannon. Ware and Treganza were not an adherents to the predominant Mormon faith in early 20th century Utah and the 17th Ward Chapel (now demolished) and the Maeser Building on the campus of Brigham Young University are the only known contracts awarded to the firm by the church.