Mary Rockwell Hook (September 8, 1877 – September 8, 1978) was an American architect and a pioneer for women in architecture. She worked principally from Kansas City, Missouri but designed throughout the United States. She was denied admission to the American Institute of Architects (AIA) because of her gender. Between 1910 - 1930, there were actually five women who worked as architects in the Kansas City area. Hook was the only one to achieve any wider recognition.