National Farmers' Federation president Jock Laurie has resigned to run for NSW parliament.
He is seeking National Party preselection to stand for the NSW seat of Northern Tablelands, vacated by independent Richard Torbay in March.
Mr Torbay quit the NSW parliament a day after the Nationals asked him to step down as their candidate for the federal seat of New England.
The information that led to that decision was referred by the Nationals to the NSW Independent Commission Against Corruption.
Mr Laurie has been in the National Farmers' Federation top job since November 2010.
He will be replaced by vice-president Duncan Fraser until the next NFF annual general meeting in November.