The Tri-State Transit Authority (TTA) is the city bus system in Huntington, West Virginia, and Ironton, Ohio, as well as its suburbs.

However the system does not interchange between the TTA and ABS in Ceredo, West Virginia, even though the buses pass within a few blocks of one another.

The TTA was involved in a joint venture with the Charleston, West Virginia-based Kanawha Valley Regional Transportation Authority bus system called Intelligent Transit which linked downtown Huntington to Charleston via bus.

The service ceased August 28, 2015 due to low ridership and lower gas prices compared to 2012.

[1] All buses begin and end at the old Greyhound Bus Depot in downtown Huntington, which is now known as the TTA Center.