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is a city in St. Charles County, Missouri, United States. The population was 1,928 at the 2000 census.
Cottleville is home to the Francis Howell Central High School Spartans and Louis C. Saeger Middle School Spartans. At Saeger Middle there is an annual Turkey Ball event every Thanksgiving. It's the students vs. teachers, the teachers have won every year except the first Turkey Ball Event. In October 2006, the Francis Howell Central Spartan Regiment was invited to represent the entire United States at the Olympic Cultural Festival in China. St. Joseph Catholic School is also located in Cottleville, providing classes for grades K-8.