Sarah (Sally) Pillsbury Harkness (July 8, 1914 — May 22, 2013), FAIA, was an American architect. She was a cofounder of The Architects Collaborative (TAC) in Cambridge, Massachusetts. She was one of two women among seven young architects who formed the firm with Walter Gropius in 1945. She was an inspirational figure for women in architecture throughout her long career; early on she valued the idea of accessible design and sustainable practices in architecture. She gave voice to these ideals in 1985 as President of the Boston Society of Architects.