Camillus Union Free School is a building built in 1912 and 1913 in the Village of Camillus, New York. It was listed on the National Register of Historic Places in 1991. The original two-story school building has a U-shaped plan. It was designed by architect Eugene Sacket of Syracuse and was constructed in 1912 and 1913. A gymnasium was added in 1928 and an elementary-school wing was added in made in 1965. The original building was largely intact as of 1991, except for the loss of a cupola that was removed after a 1951 fire. The National Register listing includes the original building and the 1928 addition. The school was deemed architecturally significant as an example of a "small village school" built in the early decades of the 20th century. It is located at First and LeRoy Streets, across a field from Nine Mile Creek. Downstream is the Nine Mile Creek Aqueduct, another Registered Historic Place.