William Appleton Potter (December 10, 1842 – February 19, 1909) was an American architect who designed numerous buildings for Princeton University, as well as municipal offices and churches. He served as a Supervising Architect of the Treasury from 1874 to 1877.
Born in 1842 in Schenectady, New York, Potter grew up in Philadelphia and attended Union College. Potter was the son of Bishop Alonzo Potter and had eight brothers, including:
He became an assistant professor at Columbia College, where he taught chemistry for a year, after which he spent another year touring France. His collegiate background distinguished him from most architects of the first half of the 19th century, who received their training through apprenticeship in the building trades and sometimes in the offices of practicing architects. The apprenticeship tradition was still strong, however, and Potter received his professional training first in the New York office of George B. Post, and then in his half-brother's office at Schenectady.
Potter died February 19, 1909. Among his apprentices was the architect James Brown Lord.
Chancellor Green Library (1871–1873) for Princeton University was Potter's first major commission. In it, he took the High Victorian Gothic vocabulary and octagonal form used by his half-brother for the Nott Memorial at Union College, and elaborated it into a complex interplay of octagons of various sizes and shapes. For Princeton, retaining Potter represented a shift from dependence on Philadelphia architects to a New York practitioner. He would receive from the college an honorary Master of Arts degree in 1872, and go on to design several other buildings on campus.