Saint Anselm Parish is in the Archdiocese of St. Louis. Saint Anselm Parish was established by Cardinal Joseph E. Ritter in August 1966, he chose Reverend Robert P. Slattery as Pastor to serve the rapidly increasing population of West County.
Saint Anselm Parish is located on the campus of the Abbey of Saint Mary and Saint Louis and shares facilities with the Benedictine Community of the Abbey. The founding superior of the monastery, Father Columba Cary-Elwes invited the Archdiocese to use the monastic church until a new church could be built nearby. A relationship that began as a temporary accommodation deepened and, in May of 1968, representative of the Archdiocese and the Benedictine Community signed agreements that the Parish of Saint Anselm be formally constituted on the grounds of Saint Louis Priory now Abbey of Saint Mary and Saint Louis.