Conrad 'Snakey' Smith, who now plays club rugby in France for Pau after retiring from international rugby in 2015, will finish his career at the end of 2018.
Smith played 126 games for the Hurricanes, 43 for the Wellington Lions and 194 games for the All Blacks.
His achievements include two rugby world cup wins in 2011 and 2015 and a victory over the British and Irish Lions in 2005.
Smith has also been admitted as a barrister and a solicitor of the High Court of New Zealand.
He told Irish news site The42 he will finish up this year and take on a role with the International Rugby Players Association.
Smith will see out the season with Pau where he plays alongside former All Black Colin Slade. His side currently sits fifth on the French Top 14 standings.
Conrad Smith was known as one of Wellington's and New Zealand's best midfielders, his toughness and game sense were just a couple of attributes that made Conrad Smith a prominent inclusion in the All Blacks.
His signature draw and pass and classy ball running proved him a class above the rest of the world.