Harrison Trimble High School (HTHS) is a high school situated in Moncton, New Brunswick, Canada. It was opened in 1953 and is Moncton's biggest school after Moncton High School. Following expansions in the 1950s and 1960s, there were almost 1200 students in grades 10 to 12 by 1975. Today it serves approximately 900 students from grades 9 through 12. Its school mascot is the Trojan. The school is represented by the colours maroon and white, its motto being "Pride in Ourselves, Pride in our School, Pride in our Community".
Harrison Trimble High School was named after a civic-minded board Trustee who showed foresight by acquiring the parcel of land on behalf of the district, at a time when the area was mostly pasture, thereby saving the school district a lot of money when time came to build.
Harrison Trimble High School has an annual event called the Trojan Trek, where every student from the school walks to the Moncton Hospital to raise awareness for The Neonatal Unit. The students fund-raise money for the event each year. In 2008 the school had raised over $100,000 since the creation of the charity.