Route 9 (Chinese: 九號幹綫), Hong Kong is one of the strategic trunk roads, mostly in the form of a motorway, circumnavigating the New Territories.

Starting from the Shing Mun Tunnels, Route 9 links (moving in an anti-clockwise direction) Sha Tin, Tai Po, Fanling, Sheung Shui, Yuen Long, Tuen Mun and Tsuen Wan.

Route 9 then runs in a northerly direction via the remaining portion of Tai Po Road - Sha Tin until the Racecourse Interchange, where it continues via the 12.3 km-long Tolo Highway (opened in 1985) to Lam Kam Road Interchange, to the north of Tai Po.

The widening of Tolo Highway between Ma Liu Shui and Tai Po to a dual 3-lane motorway was completed in 2003.

The Tolo Highway continues as another dual 3-lane expressway, Fanling Highway, which was completed in three stages between 1985 and 1987, running due north and north-west, connecting Tai Po North and Pak Shek Au, near San Tin.