T3 Transit is a Canadian public transport company operating buses throughout the Greater Charlottetown area of Prince Edward Island, including the towns of Cornwall and Stratford.

It is funded by the municipal and federal levels of government and provides service throughout the city's neighbourhoods.

The province of Prince Edward Island does not provide transit funding toward the service.

The trolley buses are smaller than conventional transit bus designs and must be able to navigate the narrower streets and intersections in the city's downtown core.

In 2018, T3 Transit ran a demonstration with an electric bus, an American made New Flyer Xcelsior CHARGE.