Pelham High School is a NHIAA-governed school, and offers a three-season interscholastic athletic program for students to join.

[3] Additionally, Pelham High School has received numerous awards for athletic achievement, including a Mr. New Hampshire Basketball award in 2016, as well as a 2015-16 Gatorade New Hampshire Boys Basketball Player of the Year that same year.

[4] Pelham High School offers a wide array of clubs, activities, and honor societies for students to be involved in throughout the year.

A club fair is held once a year in September to promote various clubs, and to persuade students to sign up.

The full list is as follows:[5] The demographic breakdown of the 655 students enrolled for the 2016–2017 school year was: