Tuen Mun–Chek Lap Kok Link, Bridge-tunnel system in Hong Kong.

The Tuen Mun–Chek Lap Kok Link is a bridge and tunnel system in Lantau Island and the New Territories of Hong Kong, connecting the northwest with the international airport. The subsea tunnel runs along the coastline while viaduct sections cross the topography of hills and bays.

The southern section of the link opened in October 2018 alongside the Hong Kong-Zhuhai-Macau Bridge. The northern part was completed in December 2020, finishing the entire route across the region.

The tunnel is named after the two places it links, Tuen Mun and Chek Lap Kok, and its Chinese short form, Tuen Chik Link Road, is used daily by drivers. The northern tunnel section is officially Tuen Mun Chek Lap Kok Tunnel Road. Since 2020 the route has been toll-free, and airport buses from Tuen Mun, Tin Shui Wai, Yuen Long and Sheung Shui were rerouted through it, cutting some fares by nearly half.

The route cuts travel time from south Tuen Mun to Hong Kong airport from around 30 minutes to about 10 minutes. Travelers find signage along the way that directs them to different exits and connections.

The tunnel was bored by a machine named Qin Liangyu, after a Ming dynasty woman general, with a diameter of 17.6 metres — about the height of a six-storey building. It was the world's largest tunnel boring machine at the time. Boring instead of the immersed-tube method avoided dumping 1,100 million cubic metres of mud, and the tunnel floor carries a common utility duct, the first in Hong Kong since HKUST in 1991.