Long-serving Waikato MP Lindsay Tisch will leave Parliament after next year's election.
Mr Tisch, a former National Party president and who became an MP in 1999, has announced he will not seek the National Party nomination for his Waikato electorate next year.
Waikato is a safe National seat, with Mr Tishch having one of the largest majorities in the country when he won the seat by 16,169 votes in 2014.
"I feel very privileged to have served and represented the constituents of the Waikato and to promote the region as a great place to live, work, and raise a family. It has given me great satisfaction and a sense of achievement," Mr Tisch said.
"I am particularly pleased that the policies I advocated for in Opposition have come to fruition," Mr Tisch said.