The South Island line (West) is a proposed extension of the Hong Kong MTR metro system.

The new line would serve the southwestern coast of Hong Kong Island, between Shek Tong Tsui and Wong Chuk Hang.

Plans for the South Island line (West) are mentioned and revised in the government's Railway Development Strategy 2014 (RDS-2014) report.

The Government proposed the southward extension of then-planned East Kowloon Line to Aberdeen from Sheung Wan in 1989.

[2] Four years later the transport authorities published a consultative document that proposed the construction of two South Island lines interchanging at Tin Wan: vertical running from Admiralty to Lei Tung via Tin Wan and Ap Lei Chau, and horizontal from Telegraph Bay (now Cyberport) to Ocean Park via Wah Fu Estate, Wah Kwai, Tin Wan, Aberdeen, and Wong Chuk Hang.