1. Talc City Hills - Inyo County (east of Owens Lake)
2. Tecopa Hills - Inyo County (east of lower Death Valley)
3. Tehachapi Mountains - Kern County (southeast of Bakersfield)
4. Tejon Hills - Kern County (within Tejon Ranch)
5. Telephone Hills - western Kern County
6. TEMBLOR RANGE - eastern edge of San Luis Obispo County (San Andreas Fault)
7. Three Sisters - Los Angeles County (Mojave Desert)
8. Three Sisters - Riverside County
9. Three Sisters - Siskiyou County
10. Tierra Blanca - San Diego County
11. TOPATOPA MOUNTAINS - Ventura County (north of Ojai)
12. Trainer Hills - Yuba County (eastern Sacramento Valley)
13. Trinity Alps - Trinity & Siskiyou Counties
14. Trinity Mountains - within Shasta-Trinity National Forest
15. Tucalota Mountains - Riverside County
16. Tumey Hills - western Fresno County
17. Turtle Mountains - northwestern San Bernardino County
18. Twin Peaks - San Francisco (2 hills in the geographic center of the city)