CityLink Pink (abbreviated PK) is a bus route operated by the Maryland Transit Administration in Baltimore.

33 shared the same track, and operated from Park Heights to Belvedere Avenue to Gwynn Oak.

The Reservoir Hill section was later eliminated, but it returned in 1996 when Bus Route 28 which then served that area was discontinued.

In 1973, a new set of branches was added to the line that served the communities of Stevenson, Caves Road, and Greenwood via Villa Julie College.

Route 5 continued to travel to Slade Avenue during hours when Metro was not operating.

In 2005, as part of the Greater Baltimore Bus Initiative, it was proposed that the Reservoir Hill deviation would be provided by a different line, and all trips would operate via Johns Hopkins Hospital.

The first Phase II proposal was to provide this service by modifying Route 97, and the second version of this proposal was to maintain Reservoir Hill service as part of Route 5, but as a separate branch that would not serve Mondawmin.