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Heung Yuen Wai Highway, also abbreviated as HYWH, is a controlled-access highway in North District, New Territories, Hong Kong. It diverges from Fanling Highway of Route 9 at Kau Lung Hang, crosses Sha Tau Kok Road and connects to Heung Yuen Wai Control Point, an upcoming border checkpoint between Hong Kong and China now under construction.

The highway comprises three parts — Lung Shan Tunnel, Cheung Shan Tunnel and 5.5 km of viaducts and at-grade roads. At 4.8 km, Lung Shan Tunnel is the longest land road tunnel in Hong Kong. It boasts two lanes in each direction, with a posted speed limit of 80 kilometres per hour.

Route description
The southern terminus of Heung Yuen Wai Highway, known as Fanling Highway Interchange, is where four viaducts connect the highway to Fanling Highway. Built using the balanced cantilever method, the viaducts were assembled from 1,300 pieces of precast concrete segments.

The highway travels northeastward as a dual-tube tunnel under Bird's Hill (also known as Lung Shan, ) called Lung Shan Tunnel. The 4.8 km tunnel is the longest land-based road tunnel in Hong Kong, 0.85 km longer than the previous record holder Tate's Cairn Tunnel. Construction of the section from Fanling Highway Interchange to Lau Shui Heung involved the drill-and-blast method, whereas the segment from Lau Shui Heung to Sha Tau Kok Road Interchange was constructed with a tunnel boring machine (TBM).

Upon leaving Lung Shan Tunnel, the highway will arrive at the Sha Tau Kok Road Interchange to the west of Loi Tung village, where it crosses Sha Tau Kok Road. It then travels northwestward in the form of a 700 m dual-tube tunnel called Cheung Shan Tunnel, named after the hill it passes under. Leaving the tunnel at Wo Keng Shan Road, the highway continues northwestward to Ping Yeung and thence to its intersection with Lin Ma Hang Road, where the highway currently ends. When the Heung Yuen Wai Control Point opens in the future, the remaining section into the checkpoint would open.

Despite built as a controlled-accessed highway with grade-seperated interchanges, Heung Yuen Wai Highway has not been designated as an expressway under the Road Traffic Ordinance (Cap. 374, Laws of Hong Kong).

History
The construction of Heung Yuen Wai Highway stemmed from the signing of Memorandum on Closer Co-operation between Hong Kong and Shenzhen in 2006, which calls for an investigation into the feasibility of building a new link between Hong Kong and China known as the Shenzhen Eastern Corridor. In September 2008 a decision was made jointly by the Hong Kong and Shenzhen governments to undertake the construction of the Liantang/Heung Yuen Wai Boundary Control Point.

The contract to construct Lung Shan Tunnel was awarded to Dragages-Bouygues Joint Venture at HK$10.314 billion. It was named Tunnelling Project of the Year in the 2019 Tunnelling Awards organized by New Civil Engineer. Meanwhile, the construction contracts for the Fanling Highway Interchange and the section between Sha Tau Kok Road and Lin Ma Hang Road were awarded to Chun Wo Construction and Engineering Company Limited and CRBC-CEC-KADEN Joint Venture respectively, at the costs of HK$2.545 billion and HK$6.518 billion. Also included in the Chun Wo contract was the widening of Fanling Highway.

The highway was opened to traffic at 8 AM on 26 May 2019.

Interchanges and major intersections
{| class="plainrowheaders wikitable hlist" !scope=col|District !scope=col|Location !scope=col|km !scope=col|Interchange name !scope=col|Destinations !scope=col|Notes
 * + Heung Yuen Wai Highway
 * rowspan=2|Tai Po
 * rowspan=2|Kau Lung Hang
 * rowspan=2 style="text-align:right"|0.0
 * rowspan=2|Fanling Highway Interchange
 * south (Fanling Highway) – Tai Po, Kowloon
 * rowspan=2|Southern terminus
 * north (Fanling Highway) – Fanling, Sheung Shui
 * rowspan=4|North
 * Sha Tau Kok
 * style="text-align:right"|6.2
 * Sha Tau Kok Road Interchange
 * Sha Tau Kok Road - Wo Hang – Sha Tau Kok
 * Ping Che
 * style="text-align:right"|9.0
 * Ping Yeung Interchange
 * Ping Yeung
 * rowspan=2|Ta Kwu Ling
 * style="text-align:right"|10.2
 * Lin Ma Hang Road Interchange
 * Lin Ma Hang Road – Heung Yuen Wai, Lin Ma Hang
 * Northern terminus until the opening of Heung Yuen Wai Control Point
 * style="text-align:right"|
 * Heung Yuen Wai Boundary
 * Eventual northern terminus
 * style="text-align:right"|10.2
 * Lin Ma Hang Road Interchange
 * Lin Ma Hang Road – Heung Yuen Wai, Lin Ma Hang
 * Northern terminus until the opening of Heung Yuen Wai Control Point
 * style="text-align:right"|
 * Heung Yuen Wai Boundary
 * Eventual northern terminus
 * Heung Yuen Wai Boundary
 * Eventual northern terminus