St. John Henry Newman Catholic High School (also known as SJHN, SJHNCHS, St. John Henry Newman CHS, St. John Henry Newman, colloquially referred to as Newman) is a Roman Catholic high school in Toronto, Ontario, Canada. It was formerly known under its original name Cardinal Newman Catholic High School until 2011 and Blessed Cardinal Newman Catholic High School until 2019. It is located in the district of Scarborough, administered by the Toronto Catholic District School Board.

The school was founded in 1973 when St. Augustine's Seminary decided to use extra classroom space due to its declining student enrollment. The school was named after Saint John Henry Newman, a 19th-century English convert to Catholicism and prolific author. Located on a 18-hectare (44-acre) campus, St. John Henry Newman Catholic High School overlooks a broad vista that contains both the Scarborough Bluffs and Lake Ontario. The motto for St. John Henry Newman is Growing in Faith and Truth.