Thom Mayne (born January 19, 1944) is an American architect. He is based in Los Angeles. Mayne helped found the Southern California Institute of Architecture (SCI-Arc) in 1972, where he is a trustee. Since then he has held teaching positions at SCI-Arc, the California State Polytechnic University, Pomona (Cal Poly Pomona) and the University of California, Los Angeles (UCLA). He is principal of Morphosis, an architectural firm in Santa Monica, California. Mayne received the Pritzker Architecture Prize in March 2005.