CT Transit (styled as CTtransit) is a public transportation bus system serving many metropolitan areas and their surrounding suburbs in the state of Connecticut.

CT Transit is a division of the Connecticut Department of Transportation, although it contracts a number of private companies for most of its operations.

Initially serving only the Hartford, New Haven, and Stamford areas, CT Transit's service now extends throughout much of Connecticut.

CT Transit provides local "city bus" service in Bristol, Hartford, Meriden, New Britain, New Haven, Stamford, Wallingford and Waterbury in addition to a number of express routes connecting to outlying suburbs and other regions of the state.

In 1901 the Connecticut Railway and Lighting Company (CR&L) was formed to operate and extend electric powered trolley services.

[2] The newly independent CR&L no longer operated any rail services, while its former lessee began eliminating street railway lines as a cost-cutting measure.

[5] It was hoped by Hartford's chamber of commerce that under Gengras the Connecticut Company could become the core of a new "mass transit district" since it was no longer affiliated with the bankrupt New Haven Railroad.

[4] Despite these higher revenues, even in 1964 there were concerns over the long-term viability of Hartford's bus operations in private hands.

[14] These changes, notably service reductions and layoffs, created much dissatisfaction among employees,[15][16] resulting in a 27-day long strike in 1965 among all Connecticut Company divisions.

[27] On September 4 the Connecticut Company's reduced schedules were implemented, although four Hartford routes were run with marginal daytime service on Sundays.

[21] In September 1971, days before its reduced schedules took effect, the Connecticut Company filed a request with the PUC in an attempt to suspend all of its services in its Stamford division,[28] as well as to increase fares in Hartford and New Haven.

On April 1, 2022, CTDOT announced it had suspended fares on all public transit buses in Connecticut,[33] which was launched in response to sharp ridership decreases following the outbreak of the Covid-19 pandemic, and heightened inflation.

Because of its reliance on contractors however, CTDOT route planning can be significantly impacted by operators' decisions, and contract disputes have led to service cuts when agreements could not be reached.

Beginning in August 2021, CT Transit contracted Peter Pan's services in the state of Connecticut along its Hartford-Providence route.

However, in the Meriden, Wallingford, and Waterbury areas the Northeast Transportation Company (NET), operates paratransit services under CT Transit livery.

[49] In February 2012, CT Transit acquired a PureCell stationary fuel cell system for their headquarters on Leibert Road in Hartford.

[51] By generating power on-site with a fuel cell, CTtransit will prevent the release of more than 827 metric tons of carbon dioxide annually – the equivalent of planting more than 191 acres (77 ha) of trees.

[50] The reduction in nitrogen oxide emissions compared to a conventional power plant are equal to the environmental benefit of removing more than 102 cars from the road.

[50] In addition to the reduction in greenhouse gas emissions, the PureCell system will enable CTtransit to save nearly 3.6 million gallons of water annually.

[52] This incident resulted in the temporary suspension of electric buses from CT Transit's fleet, which ended on July 31, 2023.