Canton McKinley Senior High School is a public high school in Canton, Stark County, Ohio, and part of the Canton City School District. It is one of the oldest high schools in Ohio, and was once one of Ohio's largest. The original McKinley building on Market Avenue North was opened on March 27, 1918. The students of Central High School and North High School were moved to the new building. The school was named for President William McKInley (whose home was across the street from McKinley High School) and his sister, Anna McKinley, who taught in the Canton Public Schools for 30 years. When it opened, it was the only high school in Canton. By 1943, it was one of four high schools, as enrollment in the city schools dictated Lehman High School, Lincoln High School, and Timken Vocational High School be opened. As the city of Canton's population declined, so did city school enrollment. In the spring of 1976, the Canton City Schools closed all four high schools in the city. Lehman and Lincoln reverted to junior high schools, and Timken Senior High School and McKinley Senior High School were their replacements. McKinley Senior opened in a new building on the site of Fawcett Stadium. In February 2015, the Canton City School board approved closing Timken as a traditional four-year high school, thus making McKinley the city's only high school for the first time since Lehman became a high school in 1937. McKinley High School's enrollment peaked in the 1935 – 1936 school year with 4,000 students attending.
Canton McKinley competes in the Federal League, one of the oldest athletic conferences in Ohio.
Canton McKinley is 7th in the nation in football wins all-time, with 813 as of December 2015. McKinley is also second in Ohio in win total.
Prior to the start of the current playoff format in Ohio high school football, McKinley had won seven AP poll titles. Since the playoff format began, McKinley has won three State Titles, in 1981, 1997, and 1998. They have been State Runner-Up three times in 1977, 1985, and 2004.
McKinley-Massillon is the 13th most played rivalry in the nation, with 126 meetings between the schools. The rivalry is also tied for the nation's 14th oldest, dating back to 1894 and was profiled in the November 14, 1994 issue of Sports Illustrated.