C (AC Transit)
| C | ||||
|---|---|---|---|---|
| Overview | ||||
| Operator | Key System (1906–1960) AC Transit (1960–2020) | |||
| Began service | 1903 | |||
| Ended service | 2020 | |||
| Route | ||||
| Locale | Piedmont, Oakland, San Francisco | |||
| Start | Highland Ave. & Highland Way | |||
| Via | Moraga, Piedmont, 40th | |||
| End | Salesforce Transit Center | |||
| Map | C | |||
| 
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The C was a bus service operated by AC Transit in the San Francisco Bay Area. It is one of the operator's many transbay routes, which are intended to provide riders a long-distance service across the San Francisco Bay between the East Bay and San Francisco. It connected San Francisco with Piedmont Avenue in Oakland and the City of Piedmont. The service was descendant of a Key System streetcar and ferry line that operated prior to the formation of AC Transit. The line was suspended in response to the COVID-19 pandemic.