Ngaio railway station is one of eight railway stations on the Johnsonville Branch, a commuter branch railway north of Wellington in New Zealand's North Island, and serves the suburb of Ngaio. The station was erected and operated by the Wellington and Manawatu Railway Company (WMR) on their line from Wellington to Longburn. The area served by this station used to be called Crofton, until the suburb was renamed to Ngaio in 1908 to avoid confusion with Crofton, a suburb of Marton in the Manawatu. From the acquisition of the WMR by the New Zealand Railways Department in 1908 until the opening of the Tawa Flat deviation in 1937, the station was on the North Island Main Trunk railway. On 2 July 1938, the truncated section of the line to Johnsonville became the Johnsonville Branch.

The Johnsonville Branch, also known as the Johnsonville Line, is a commuter branch line railway from the main Railway Station of Wellington, New Zealand to the northern suburb of Johnsonville via Ngaio and Khandallah.