CLP Group Headquarters, Grade I historic office building in Kowloon City District, Hong Kong.

The CLP Group Headquarters is a five-storey red-brick building at 139–147 Argyle Street in Ho Man Tin, completed in 1940 to a design by architect Kwan Wing-hong. Its symmetrical wings flank a 45-metre clock tower with a round clock face and a vertical channel of tall windows. The ground floor and first floor now house the free CLP Clock Tower Culture Gallery.

Designed by architect Kwan Wing-hong, the CLP head office was built to serve Kowloon's rising population: the foundation stone was laid in 1938 and the five-storey red-brick building with its symmetrical wings opened in 1940. Its 45-metre clock tower, in the Modernist style, was likened to the clock tower of the demolished second-generation Central Star Ferry pier. CLP moved its headquarters to a new tower at 43 Kai Cheung Road, Kai Tak, and in 2023 the ground floor and first floor of the old building reopened as the free CLP Clock Tower Culture Gallery.

The clock tower now houses the CLP Clock Tower Culture Gallery, opened on 18 May 2023 on the ground and first floors. Its three exhibition zones cover the history of electricity, the Kadoorie family's presence in Hong Kong, and local intangible cultural heritage. A café stands inside, alongside a retired fifth-generation Peak Tram car.

The former CLP headquarters stands at 139-147 Argyle Street in Ho Man Tin, Kowloon, not in a central business district. The CLP Clock Tower Culture Gallery on the ground and first floors opens Tuesday, Wednesday and Friday to Sunday from 10:00 to 18:00, closing Mondays, Thursdays and public holidays; admission is free. The corporate headquarters has moved to 43 Kai Shing Road in Kai Tak.

The clock tower, 45 metres tall, was designed by architect Kwan Wing-hong in the modernist style, like the second-generation Central Star Ferry clock tower that has since been demolished. The site's redevelopment, approved in 2011, kept only the tower while building three 25-storey residential blocks behind it.