Citybus Route 13 on Hong Kong Island is a bus service operated by Citybus, between Admiralty (Tamar Street) and Kotewall Road, Mid Levels.

Route 13 service was started by China Motor Bus (CMB) on 16 April 1974, when the first bus lane in Hong Kong, the one along westbound Caine Road, came into operation.

At that time, the main bus fleet on the line was Guy Arab Mk V (LX class).

When CMB planned to operate a new service between Star Ferry Pier and Kotewall Road, the decision to use the number 13 caused controversy within the upper levels of the company.

[1] The route length from City Hall towards Kotewall Road is 5.3 km in a time of 27 minutes, using (in order):[3] The route length from Kotewall Road towards City Hall is 3.7 km in a time of 21 minutes, using (in order):[3]