St. Benedict is a census-designated place (CDP) in Nemaha County, Kansas, United States. As of the 2020 census, the population was 50. It is located three miles north of the western edge of Seneca.
A post office was opened in Saint Benedict in 1883, and remained in operation until it was discontinued in 1902.
The community currently consists of over a dozen homes near the tall St. Mary's Church, which was built in 1893.
The community is served by Nemaha Central USD 115 public school district.