Canisius High School is a Jesuit high school located in the United States in Buffalo, New York. The school takes its name from St. Peter Canisius, one of the early members of the Jesuits. It is located in the New York Province of the Society of Jesus and was founded in 1870. The school was first located on Ellicott Street in downtown Buffalo, but quickly outgrew that location and moved to a building on Washington Street in 1872. In 1944, the school split from the college and moved to its current location on Delaware Avenue in Buffalo's Delaware District.