Madrid–Waddington Central School, often shortened to MWCS, is a public school offering Pre-Kindergarten through Grade 12 education located in Madrid, New York. It is a small, rural district located in St. Lawrence County on State Highway 345 between the communities of Madrid and Waddington, New York. MWCS has an enrollment of approximately 650 students last estimated circa 2016.

Eric Burke is the current Superintendent of Schools. The Board of Education consists of nine members who are elected by the residents of the district. These members are Andy Bracy, Richard Hobkirk, Brian Hammond, Gerald Molnar (Vice President), Tina Wilson Bush, Jordan Walker, Matthew O'Bryan (Board President), Katie Logan, and Charles Grant.

MWCS is a PK (pre-kindergarten)- 12th grade school. It is divided into two sections, the elementary being split by a fourth lobby in the center of it. The HS lobby is next to the HS cafeteria (looks a bit like a greenhouse) and the elementary has a huge skylight. The third lobby is next to the auditorium.

Pre-K, JK, and Kindergarten constitute the pre-school. 1st-5th grades are the elementary school. 6th-8th grades are middle school, and 9th-12th is high school. Of note, the High School has been well established since 1959; however, the elementary Schools of Madrid and Waddington only merged in 1991. There are several events a year, including numerous dances and assemblies. The district includes parts of Canton, Chase Mills, Madrid, parts of Lisbon and Potsdam, and Waddington.