CityLink Green (abbreviated GR) is a bus route operated by the Maryland Transit Administration in Baltimore and its suburbs.

Route 3 gained ridership along Loch Raven Boulevard in Baltimore County even prior to the corridor's development.

[8] In 1990, a new branch was added to Route 3 that operated to Towson and Sheppard Pratt primarily along Joppa Road.

In 2005, as part of the Greater Baltimore Bus Initiative, a comprehensive overhaul plan for the region's transit system, MTA proposed to eliminate the Sheppard Pratt branch on the route, and eliminate all short turns, except for the Goucher & Taylor loop during peak hours.

Sheppard Pratt branch riders were instructed to transfer to Route 55, which was proposed to have an improved frequency.

The new proposal would not only retain the Sheppard Pratt branch, but would modify its route to serve Osler Drive and provide weekend service in this area.