Route 3 (Chinese: 三號幹綫) is a series of expressways in Hong Kong that runs from Sai Ying Pun on Hong Kong Island to Yuen Long in the New Territories, linking West Kowloon, Kwai Chung and Tsing Yi.

The Western Harbour Crossing and Tai Lam Tunnel that form part of the route are tollways.

From then on it heads northwest on a viaduct along the West Kowloon Highway, above the Tung Chung line and Airport Express tracks.

The interchange is a gateway to Lantau Island and Chek Lap Kok Airport.

Route 3 then makes a sharp turn and travels north on Ting Kau Bridge and quickly enters the tolled Tai Lam Tunnel.