Caleb Tiernan (born January 23, 2003) is an American college football offensive tackle for the Northwestern Wildcats.
Tiernan attended Detroit Country Day School in Beverly Hills, Michigan. A four-star recruit, he committed to play college football at Northwestern University over offers from Michigan, Ohio State, and Penn State.
After playing sparingly and redshirting in 2021, Tiernan's role increased, starting every game during the 2023 and 2024 seasons. He returned for his redshirt senior season in 2025. Entering the 2025 season, Tiernan is considered one of the top offensive tackle prospects in the 2026 NFL draft.