Nyngan [pr: ning-g'n] is a town in the centre of New South Wales, Australia in the Bogan Shire local government area within the Orana Region of central New South Wales. At the 2006 census, Nyngan had a population of 1,975 people. Nyngan is situated on the Bogan River between Narromine and Bourke, on the junction of the Mitchell Highway and Barrier Highway, 583 km north-west of Sydney. The Barrier Highway starts at Nyngan, and runs west to Cobar and on through Wilcannia and Broken Hill into South Australia.
It is on the Main Western railway line of New South Wales but is no longer served by passenger trains. The line remains open to freight traffic.
About 70 kilometres south of the town a cairn has been erected to mark the geographical centre of New South Wales.
The district was originally inhabited by the Ngiyambaa Aborigines. Thomas Mitchell explored the Bogan River in 1835, camping on the future townsite. He recorded the local Aboriginal word nyingan, said to mean 'long pond of water', though other meanings have been put forward, such as mussel or crayfish. Squatters had settled in Mitchell's wake before he had begun his return journey.