Willard Close Northup (1882–1942) was an American architect in North Carolina, who was the principal partner in the firm Northup & O'Brien. His firm was based in Winston-Salem, North Carolina. Northup began his architectural practice in 1906 and partnered with Leet Alexander O'Brien (1891–1963) in 1915 or 1916. Luther Lashmit joined the firm in 1927, and was lead architect for Graylyn while an employee of the firm.
Either alone or with O'Brien, Northup designed many of the prominent buildings of the period in Winston-Salem and elsewhere in North Carolina, along with over one hundred schools in the state.
A number of his works and the works of Northup & O'Brien are listed on the U.S. National Register of Historic Places (NRHP).
Works include: