The Hutt Park Railway was a private railway in Petone at the southern end of the Hutt Valley in New Zealand's North Island. It operated from 1885 as a branch from the Hutt Valley section of the Wairarapa Line, from 1915 truncated as an industrial siding.
The Hutt Park Railway was constructed to serve the Hutt Park Raceway horse racing track of the Wellington Racing Club (WRC). The WRC was in competition with the Wellington Jockey Club's track in Island Bay and sought the competitive advantage of a railway to provide easier access for patrons. The first proposals for a line were made as early as 1874, not long after the first portion of the Wairarapa Line was opened to Lower Hutt, but this proposal was rejected by the 1880 Royal Commission. Nonetheless in 1884 the Hutt Park Railway Company was formed and the 3.2 kilometre line was constructed in 38 days. Construction took place without authorisation; to resolve a legal dispute in the High Court, section 137 of the Reserves and Other Lands Disposal and Public Bodies Empowering Act 1915 legitimised the line.
The junction with the main line was at a flag station known as Beach, and the line terminated at Hutt Park, a 122-metre long platform by the western bank of the Hutt River. In the 1901 Working Timetable these two stops are called Petone Junction and Racecourse Platform respectively. Trains ran whenever there was a race meeting, approximately four times a year for one or two days, from Te Aro at the end of the Te Aro Extension via Lambton Railway Station, a predecessor of Wellington Railway Station. They were run by the New Zealand Railways Department on behalf of the Hutt Park Railway Company and typically employed a WA class tank locomotive as motive power.