Cathy Simon is an American architect. She is known for her adaptive reuse and urban design projects, many of which are in the Bay area. She is currently a Design Principal at Perkins and Will. She was one of five founding partners of the influential female-owned firm SMWM (Simon Martin-Vegue Winkelstein Moris), based in San Francisco. She and Martin-Vengue have spent more than 18 years "building one of the nations largest women-owned firms." She has worked on major projects including the conversion of the San Francisco Ferry building, the San Francisco Main Library, the renovation of PG&E's San Francisco headquarters, and the San Francisco Conservatory of Music.