Nyngan is a town in the central west of New South Wales, Australia. It is located in the Bogan Shire Local Government Area. At the 2006 census, Nyngan had a population of 1,975 people. The place name could have been derived from an aboriginal word for "mussel" or "crayfish".
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.