Chek Lap Kok was an island in the western waters of Hong Kong. Together with the smaller Lam Chau, it was leveled and merged via land reclamation into the 12.48 km² platform for the current Hong Kong International Airport, which opened for commercial operations in 1998. The airport is therefore popularly referred to as Chek Lap Kok Airport.

Hong Kong SkyCity, a business and entertainment complex, is also located on Chek Lap Kok. It includes AsiaWorld-Expo, a convention and exhibition centre, which opened in 2005. Cathay Pacific City, the head office of Cathay Pacific, and the head offices of Dragonair and Hong Kong Airlines are also located on the airport platform.

The name of the island may be derived from the bareness of the island ('da chek lak'), that the shape of the island resembles the red tripletail perch ('chek lap', 赤鱲), or that the fish was once abundant in its vicinity.

The island is located north of Lantau Island off Ma Wan Chung and Tung Chung. Before the building of the airport platform, it was a small and hilly island, about 4 km long, with an area of 3.02 km² (other sources mention 2.8 km²). The southern end of the island formed a small peninsula, which has been left largely undeveloped. This area is facing Tung Chung and is now named "Scenic Hill". It is the site of the Ancient Kiln Park and the Airport Island Angle Station of the Ngong Ping 360 cable car.