Clubs P-Z
- Paper for Water
- Pawsative Service
- Peace Foundation
- Philosophy
- Picnics for a Purpose
- Ping Pong
- Powerlifting
- Pre-Med
- Propaganda
- Psychology
- Quizbowl
- Ribbon Project
- Ronald McDonald House
- ROOTS
- Rustic Pathways Student Travel
- S.M. Wright
- Salvation Army
- Scots Help Kids Rise
- Scots on the Block
- Seeds for Life
- She's the First
- Singing for Seniors
- Sisterhood
- SNL Comedy
- Soccer Tennis
- Soles4Souls HP
- Spanish-Amigos
- Spanish Immersion
- Special Olympics
- SRF Shop
- Student Recycling Committee
- Students for Justice in Palestine
- Students Supporting Students
- Technology Student Association
- Texas Outdoors
- Therapeutic Arts
- Thespian Society
- Together We
- TTGC (Teamwork Through Games Club)
- True Grit
- Turn the Page
- Turning Point USA at HPHS
- Ultimate Frisbee
- UNICEF
- Upcycling
- Vogel Alcove
- Voice of Hope
- Volunteer Council
- Wall Street
- Water Polo
- We Can Help
- Women in Business
- Women's Student Organization
- World Vision
- Young Entrepreneurs
- Young Progressives
- Young Republicans
- Youth and Government