Arneson River Theater is an outdoor performance theater located in the San Antonio River Walk in the U.S. state of Texas. The open-air venue was erected 1939-1941 by the Works Progress Administration. The design was supervised by architect Robert H.H. Hugman. It is named after Edwin Arneson, the regional engineer for the W.P.A. who was instrumental in securing funding for the Paseo del Rio. Arneson died before construction began.