CUE Bus^[a][5] is a public transit service operated by the City of Fairfax, Virginia. It consists of two routes, and is independent of WMATA and the Fairfax Connector bus service operated by Fairfax County. In 2025, the system had a ridership of 965,000, or about 2,700 per weekday as of the first quarter of 2026.^{[citation needed]}

In 2020, CUE stopped collecting fares to reduce passenger contact during the COVID-19 pandemic; as of March 2026, no fares have been charged since. In January 2022, the City Council approved a plan to formalize a 3-year zero-fare pilot program that would make CUE free to ride through June 2025.^[6][7] In the spring of 2022, CUE was awarded a Transit Ridership Incentive Program grant from the Virginia Department of Rail and Public Transportation, which allowed the City to extend the pilot program for an additional year, making CUE free to ride through June 2026.

CUE operates two loop routes between George Mason University and the Vienna Metro station, each running in both directions for a total of four named routes. The Green loop, consisting of routes Green 1 (clockwise) and Green 2 (counterclockwise) operates on the east side of Fairfax, while the Gold loop, consisting of routes Gold 1 (clockwise) and Gold 2 (counterclockwise) operates on the west side. Headways on each individual route are approximately 30–35 minutes on weekdays and 60–70 minutes on weekday evenings and weekends.

In addition to providing service to GMU and Vienna Metro, the CUE serves all major activity centers in the City of Fairfax, including downtown, Kamp Washington, Old Town Fairfax, Fairfax Circle and Fair City Mall.

As of May 2022^[update], the CUE Bus fleet is entirely clean diesel fueled. The system operates twelve 35 foot (11 m) Gillig BRT buses. Half of these vehicles replaced the remaining Gillig Phantom vehicles in the fall of 2015, while the others entered service in May 2022 replacing the agency's hybrid buses.

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