Arundel High School is a public high school located in Gambrills, Maryland, a suburb of Baltimore located in Anne Arundel County. The school is part of the Anne Arundel County Public School system, and is the primary high school for Gambrills and portions of the Odenton and Crofton areas.

Originally, the school was the Anne Arundel Academy, a prestigious one-room private school founded in 1854. That institution became Arundel High School in 1926. It is one of the oldest public high schools in the country. The current school building was built in 1949 and first occupied in 1950, with additions/renovations in 1966, 1986, 1987, 2006, and 2008.

Arundel High School's September enrollments, 2004–2022:

Arundel High School only has one feeder middle school, Arundel Middle School. Arundel Middle School has 6 feeder elementary schools: Four Seasons, Nantucket, Odenton, Piney Orchard, Two Rivers, and Waugh Chapel.

As per the approved Phase II redistricting plan that was approved by the AACPS Board of Education on November 19, 2025, a portion of students attending Nantucket Elementary School in Crofton will feed to Arundel Middle and High Schools beginning in the 2026-2027 school year.

As of 2024 the student body is 37.8% White, 32.4% Black, 13.0% Hispanic and Latino, 5.7% Asian, and 10.7% of students identify as being of two or more races, with 23.8% of students being eligible for free or reduced–price meals.

Arundel High School frequently ranks among the top high schools in AACPS and the state of Maryland:

Arundel High School competes in the Anne Arundel County Division of Maryland's 4A subdivision