Labour list MP Mita Ririnui will leave Parliament at the end of this term.
Mr Ririnui said he wanted to work with his people in the Bay of Plenty.
"It's been a wonderful 12 years, many of which I spent as a minister helping shape policies designed to improve the lives of Maori throughout the country. It doesn't get any better than that.
"It's now time to go and work on some new challenges. My focus will be on leading Tauranga iwi through the settlement process and providing them with any guidance and assistance they may need. I also intend to be involved in the post-settlement challenges that iwi will be confronted with. These are exciting times."
Mr Ririnui is from Tauranga and represented Waiariki from 1999 until 2005. He has previously served as Associate Minister of Treaty Negotiations, Health, Corrections and Forestry.
"It was a highlight of my career to be given the opportunity to move the address and reply motion in 1999, effectively launching nine years of the Labour Government.
"I appreciate the experiences and opportunities I've had during my time here. I'm proud of my achievements and I wish my Labour colleagues all the best for the upcoming election."
Labour leader Phil Goff said Mr Ririnui was a valued member of caucus.
"I'd like to acknowledge the contribution that Mita has made to the Labour caucus during his 12 years in Parliament, particularly the work he has done on behalf of the Maori community and the Ratana movement."
