Clubs H-O
- Habitat for Humanity
- HEADstrong Club
- Helpful Hands
- Helping Hats for Helping Hands
- Hilites
- HTRs Club
- Humans of Highland Park
- Highland Park Business and Investments Club
- Highland Park High School Italian Club
- HP Ambassadors
- HP Bye Bye Bags
- HP Engineering Club
- HP Latin Club
- HP Robotics
- HP Child Life Club
- HP Bass Team
- HP DKMS
- HPHS Service Squad
- HP Games Club
- Highland Park Clay Target Team
- Highland Park Esports Club
- Highland Park Ultimate Frisbee
- HP Crew Club
- Ice Hockey
- International Thespian Club
- Iron Sharpens Iron
- Klife
- Kostumes for Kids
- Lacrosse (Boys)
- Lacrosse (Girls)
- Latin Club
- Litfest Club