Mandarin High School (MHS) is a public high school in Jacksonville, Florida, United States. It was established in 1990 and is part of the Duval County Public Schools district. As of 2010, it is the second-largest high school in Duval County following Sandalwood High School. Atlantic Coast High School opened in 2010 to prevent overcrowding at the school as well as Sandalwood, Englewood and Wolfson.