Sun Tran
| Parent | City of Tucson |
|---|---|
| Founded | 1969 |
| Headquarters | 3920 N. Sun Tran Blvd |
| Locale | Tucson, Arizona |
| Service type | bus service, paratransit |
| Routes | 42 (29 regular & 13 express) |
| Stops | 2,200+ |
| Stations | 3 |
| Fleet | 237 buses |
| Daily ridership | 62,500 (weekdays, Q1 2025) |
| Annual ridership | 18,600,500 (2024) |
| Fuel type | Biodiesel, Biodiesel-Urea, CNG |
| Operator | Fixed-Route, Sun Link: Tucson Transit Management, (RATP Dev)/ Sun Shuttle: Total Transit, Ajo Transportation |
| Website | suntran |
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Sun Tran is the public transit system serving the city of Tucson, Arizona. In 2024, the system had 18,600,500 rides, or about 62,500 per weekday as of the first quarter of 2025. 100% of the fleet utilizes clean-burning fuels, such as compressed natural gas (CNG), biodiesel, and hybrid technologies. In addition to more than 40 bus routes, the system also includes the Sun Link modern streetcar line.