Clockenflap Music and Arts Festival, commonly abbreviated to "Clockenflap", is an annual music and arts festival held in Hong Kong. It incorporates international, regional and local live music, film, art installations, street, and kids' area. 60,000 people attended the 2015 event, which was widely considered HK's marquee music event of the year.

Clockenflap was founded in 2008 and is organized by Jay Forster, Mike Hill and Justin Sweeting. Their stated goals for the festival are to nurture the Hong Kong arts, music and film scene and "put the city on Asia's contemporary media-arts circuit". The NME credits Clockenflap for the "pioneering role it has played in nurturing the Hongkong indie and alternative music scenes, as well as bringing International talent to Hongkong audiences".

The first Clockenflap festival was held in a concrete public space in an empty housing development called "Cyberport", in front of 1500 attendees. It later expanded to the West Kowloon Cultural District.

Clockenflap 2025 was held from 5 December to 7 December 2025 in Central Harbourfront Event Space.

Clockenflap 2024 was held from 29 November to 1 December 2024 in Central Harbourfront Event Space.

Clockenflap 2023 was held from 3 to 5 March 2023 and from 1 to 3 December 2023 in Central Harbourfront Event Space.

Clockenflap 2021 was curtailed due to restrictions on international travel, tightened rules and regulations on outdoor events, and a requirement for a seated audience with no food or drink consumption on site.

Clockenflap 2020 had to be postponed due to the coronavirus pandemic.