Six of the MTR rapid transit system's eleven lines service Hong Kong Island.
The Island line and South Island line run exclusively on Hong Kong Island, with the Island line serving the north shore at 17 stations, and the South Island line connecting four stations on Ap Lei Chau and in Wong Chuk Hang to the north shore at Admiralty station.
Four MTR lines – the Tsuen Wan line, the Tseung Kwan O line, the Tung Chung line and the Airport Express – connect the north shore with Kowloon and provide onward service to the New Territories; the East Rail line is to provide another cross-harbour connection upon its extension from Hung Hom station to Admiralty station in 2021.
In future, the planned North Island line infrastructure project would extend both the Tung Chung line and the Tseung Kwan O line to connect them to each other, forming a route parallel to the middle section of the Island line.

Two other rail systems, Hong Kong Tramways and the Peak Tram, also run exclusively on Hong Kong Island.
The former runs mostly parallel to the Island line between Kennedy Town and Shau Kei Wan, with a loop linking Causeway Bay and Happy Valley; the latter is a funicular linking Central District to Victoria Peak.

Hong Kong Island is connected to the Kowloon Peninsula on the mainland by two road-only tunnels (the Cross-Harbour Tunnel and the Western Harbour Crossing), two MTR railway tunnels (Tsuen Wan line and Tung Chung line/Airport Express) and one combined road and MTR rail link tunnel (Eastern Harbour Tunnel, containing the Tseung Kwan O line and road traffic in separate parallel conduits).
There are no bridges between the island and Kowloon, although two bridges – the Ap Lei Chau Bridge, a road bridge, and Aberdeen Channel Bridge, part of the South Island line – connect the island to Ap Lei Chau.
Six of the MTR rapid transit system's eleven lines service Hong Kong Island. The Island line and South Island line run exclusively on Hong Kong Island, with the Island line serving the north shore at 17 stations, and the South Island line connecting four stations on Ap Lei Chau and in Wong Chuk Hang to the north shore at Admiralty station. Four MTR lines – the Tsuen Wan line, the Tseung Kwan O line, the Tung Chung line and the Airport Express – connect the north shore with Kowloon and provide onward service to the New Territories; the East Rail line is to provide another cross-harbour connection upon its extension from Hung Hom station to Admiralty station in 2021. In future, the planned North Island line infrastructure project would extend both the Tung Chung line and the Tseung Kwan O line to connect them to each other, forming a route parallel to the middle section of the Island line.
Two other rail systems, Hong Kong Tramways and the Peak Tram, also run exclusively on Hong Kong Island. The former runs mostly parallel to the Island line between Kennedy Town and Shau Kei Wan, with a loop linking Causeway Bay and Happy Valley; the latter is a funicular linking Central District to Victoria Peak.
Hong Kong Island is connected to the Kowloon Peninsula on the mainland by two road-only tunnels (the Cross-Harbour Tunnel and the Western Harbour Crossing), two MTR railway tunnels (Tsuen Wan line and Tung Chung line/Airport Express) and one combined road and MTR rail link tunnel (Eastern Harbour Tunnel, containing the Tseung Kwan O line and road traffic in separate parallel conduits). There are no bridges between the island and Kowloon, although two bridges – the Ap Lei Chau Bridge, a road bridge, and Aberdeen Channel Bridge, part of the South Island line – connect the island to Ap Lei Chau.
Hong Kong Island