Wainui railway station was a flag station between Paekakariki and Paraparaumu on the Wellington-Manawatu Line in New Zealand, when the line was run by the Wellington and Manawatu Railway Company. This line is now part of the Kapiti section of the North Island Main Trunk. The station was opened on 1 December 1886 and closed on 3 February 1902. It served the rural area between Paekakariki and Paraparaumu. The platform was on the west side of the line according to Cassells, who shows a blind siding on the east side of the line with the south end joining the main line.