Denis Morris Catholic High School is a Catholic high school located in St. Catharines, Ontario. The school is administered by the Niagara Catholic District School Board.

Denis Morris provides educational programs and services for students with a variety of learning strengths, needs and abilities.

Denis Morris is known well for its many exceptional athletes. In the past the Reds have dominated in ice hockey, winning SOSSA for many years in a row, wrestling, having many athletes reaching the OFSAA championship for the past two years, and Canadian football, winning numerous championship in the history of the school.

The school is named after Rev. Denis Morris, the pastor of St. Catherine of Alexandria Church from 1909 until 1935, when he died.

This article's list of alumni may not follow Wikipedia's verifiability policy. Please improve this article by removing names that do not have independent reliable sources showing they merit inclusion in this article AND are alumni, or by incorporating the relevant publications into the body of the article through appropriate citations. (May 2012)

• Linda Evangelista – supermodel
• John Zaritsky – filmmaker
• Tanya Memme – television host, movie star, singer, model
• Owen Nolan – professional hockey player
• Dallas Green – Juno Award winner, singer, songwriter (Alexisonfire, City and Colour)
• Riley Sheahan – collegiate hockey player and 1st-round pick of the Detroit Red Wings
• David Sutcliffe – actor
• Mark Johnston – Olympic swimmer

• Education in Ontario
• List of secondary schools in Ontario

• Denis Morris Catholic High School