The H Line is a RapidRide bus route in Seattle and Burien in King County, Washington, United States.

Service began on March 18, 2023, replacing Route 120 after the construction of new stations and bus lanes at a cost of $154 million.

It is the first RapidRide line to open under the Move Seattle program, which was funded by a levy approved in 2015.

[1][6] Development of the route into RapidRide service, alongside other improvements to the corridor, began in late 2017.

[3] The northern terminus of the H Line is in Downtown Seattle at 3rd Avenue and Virginia Street.