20 is a Hong Kong bus route operated by Citybus, plying between Kai Tak (Muk On Street) and Cheung Sha Wan (Hoi Tat).

This route was introduced in April 2018[1] in conjunction with population intake in the Kai Tak Development.

[2] Population growth in the Kai Tak Development Area, which was redeveloped from the former Hong Kong International Airport, resulted in increased travelling demand to and from the district.

It was envisaged that the one serving between Kai Tak and Island Harbourview in Tai Kok Tsui would improve the linkage between the areas of Tai Kok Tsui, Yau Ma Tei, Argyle Street and Kai Tak.

The Transport Department invited franchised bus companies to submit proposals on operating the three routes.