The Nationals MP for the mid-north coast electorate of Oxley, Melinda Pavey, announced her decision in a Sydney newspaper on Sunday.
Her Nationals leader, Paul Toole, said she had been a passionate advocate for regional communities for 20 years.
"She has served across both chambers of the NSW Parliament, entering the Legislative Council just weeks after giving birth to her daughter, Emily," he said in a statement.
"Mel can be proud that her time in the parliament and as a long-time member of the NSW Nationals team has helped deliver a stronger regional NSW for the next generation."
Ms Pavey joins a stream of Liberal and Nationals MPs throwing in the towel ahead of the NSW state election in March next year.
The Liberal departure list so far includes Corrections Minister and Parramatta MP Geoff Lee, Customer Service Minister and Ryde MP Victor Dominello, Riverstone MP Kevin Conolly and Vaucluse MP Gabrielle Upton.
Departing Nationals MPs include the member for the seat of Clarence Chris Gulaptis and Myall Lakes MP Stephen Bromhead, and now Ms Pavey.
Infrastructure, Cities, and Active Transport Minister Rob Stokes, who holds the Liberal seat of Pittwater, earlier this month said he was still weighing up whether or not to run again.
There's also speculation another Liberal, Health Minister Brad Hazzard, is also considering his political future.
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