Portland High School (PHS) competes in 18 different sports as a member of the Shoreline Conference.
Fall athletic opportunities include Boys' and Girls' Cross Country and Boys' and Girls' Soccer, and Football (Co-op with Cromwell High School). Winter sports include Boys' and Girls' Indoor Track, Cheerleading, Wrestling, and Boys' and Girls' Basketball are offered. Spring sports include Boys' and Girls' Track and Field, Golf, Boys' and Girls' Tennis, Softball and Baseball. Several sports also offer sub varsity teams.
The Shoreline Conference is comprised of 13 High Schools: Coginchaug, Cromwell, East Hampton, Hale Ray, Haddam-Killingworth, Hyde Leadership, Morgan, North Branford, Old Lyme, Old Saybrook, Portland, Valley Regional, and Westbrook.