Grand Valley High School is a public high school in Orwell, Ohio, United States. It is the only high school in the Grand Valley Local School District. It serves the students of Hartsgrove, Orwell, Rome, Colebrook, and Windsor townships in Ashtabula County. Students at Grand Valley High School have the opportunity to enroll in a Post Secondary Education Option or attend the Ashtabula County Technical & Career Campus (A-Tech) for career technical programs. Athletic teams compete as the Grand Valley Mustangs in the Ohio High School Athletic Association as a member of the Northeastern Athletic Conference.

Over 1,400 students attend classes in one elementary, one middle, and one high school, all located on one campus. Special features of the elementary curriculum include instruction in art, music, and physical education.

Parents and community members have provided active support of P.T.O.s, Athletic Boosters, Band Boosters, Academic Boosters, Choir Boosters, and Drama Boosters, as well as, individual school-sponsored activities and programs. The district has a P-12 244,000 sq. ft. facility which is situated on 94.6 acres completed in August 2005. A football stadium and track facility complete with an eight-lane weather track adjacent to the new school opened in August 2006.

Sports offered include Basketball, Football, Volleyball, Golf, Soccer, Track, Cross Country, Baseball, Softball, and Wrestling.

• Boys Track and Field – 1943*

* Title won by Stewart High School in Rome Township prior to merging into Grand Valley.

• Wrestling - 1980 (Bill Nye & Mike Fletcher State Champions)

• Football - 1966, 1978, 1979, 1981, 1987, 1992, 1996, 1997, 2012, 2013, 2015, 2016, 2017

• Girls Basketball - 2024

• District website