Chaminade College Preparatory School is an independent, college preparatory Catholic school administered by the Marianist Order for boys in grades six through twelve in the Archdiocese of St. Louis. The school is located in Creve Coeur, Missouri.

The school offers 7-day, 5-day, and temporary boarding. Students come from throughout the United States and from countries throughout the world. Marianist Hall, the name of the newly constructed dormitory, accommodates up to eighty-six residents along with twelve prefects across its 31,700 square feet of living space.

The school bears the name of William Joseph Chaminade, a priest who lived during the era of the French Revolution and who founded the religious order that runs the school. The school maintains an active relationship with the Marianists through governance structures and the employment of lay and religious Marianists.