St. John's College was a two-year college located in Winfield, Kansas and was operated by the Lutheran church. The school began operation in 1893 and ceased operation in 1986, after over 9,000 students had been through its programs.

The college facilities now make up what is called "Baden Square", named to honor the college founder John Peter Baden. The City of Winfield uses the facilities for civic functions and municipal activities. Mundinger Hall and Rehwinkle Hall are listed on the National Register of Historic Places.