The United Farmers' and Woolgrowers' Association of New South Wales was formed in 1962 from a merger of the Farmers' and Settlers' Association (c. 1893) and the Wool and Wheat Growers' Association which had split from the Farmers' and Settlers' Association in 1930. In 1968 it amalgamated with the Australian Primary Producers' Union (NSW Division) and the Apple and Pear Growers' Association, and with the Vegetable Growers' Association in 1969. It was registered as the United Farmers' and Woolgrowers' Industrial Association of New South Wales in 1969. On 1 January 1978 the United Farmers' and Woolgrowers' Association of New South Wales merged with the Graziers' Association of New South Wales to form the Livestock and Grain Producers Association of New South Wales. The Dairy Section then split off to merge with the NSW Milk Producers' Association and the Primary Producers' Union to form the NSW Dairy Farmers' Association.

The Livestock and Grain Producers' Association of New South Wales was formed on 1 January 1978 when the Graziers' Association of New South Wales and the United Farmers' and Woolgrowers' Association of New South Wales merged. It was renamed the NSW Farmers' Association on 1 January 1987.

The NSW Farmers' Association dates from 1 January 1987 when the Livestock and Grain Producers' Association of New South Wales changed its name. It is a constituent member of the National Farmers' Federation.