William Richard "W. R." Morton Keast (May 31, 1888 – May 23, 1973) was an American architect from Philadelphia, Pennsylvania.
Keast began construction of the Philadelphia Family Court Building in 1938.
During his summer vacation he worked for Cope and Stewardson and was later employed by Paul P. Cret and Albert Kelsey assisting on the design for the Pan American Union Building located in Washington, D.C.
In 1910, Keast began his long time employment with John T. Windrim.
Keast died in Montgomery County, Pennsylvania, on May 23, 1973, at the age of 84.