Caruso St John is an international architectural firm established in 1990 by Adam Caruso and Peter St John. It has gained areputation for designing contemporary projects in the public realm. The practice came to public attention with The New Art Gallery Walsall, a commission won in an international competition in 1995. From these origins in the visual arts, where a sensitivity to experience and context is required, the practice has extended its expertise.

The practice is international in its outlook and in its make up, with many of the staff, including the partners, involved in teaching in schools of architecture, such as the final year design studio at the University of Bath (2002-4). The office of approximately 30 work in an open studio in a 1930s factory building in East London which the practice converted to studio use for themselves. In 2010 a second office was opened by the practice in Zurich.