Helsinki City Transport or HKL (Finnish: Helsingin kaupungin liikennelaitos, Swedish: Helsingfors stads trafikverk, abbreviated to HST) was the official city-owned public transport company in Helsinki, Finland.

HKL's bus operations were merged with another city-owned company, Suomen Turistiauto, to form a new bus company called Helsingin Bussiliikenne, which has since been acquired by Koiviston Auto.

Until the founding of HSL in January 2010, HKL was responsible for the planning and organization of all public transport in Helsinki.

[1] The majority of HKL's operations, excluding certain parts of the Metro operations, were corporatised and moved to Metropolitan Area Transport Ltd in February 2022.

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