Toulon president Mourad Boudjellal has revealed that Nonu has penned a one-year contract extension with the club.
That means the two-time Rugby World Cup winner will stay with the Top 14 outfit until June 2018.
The 34-year-old joined Toulon after helping New Zealand to defend their Rugby World Cup crown at the 2015 tournament in England.
Nonu, who won New Zealand's Kelvin R Tremain Player of the Year award in 2015, battled in his first year with Toulon but has impressed during the 2016/17 season, scoring three tries in 19 matches in all competitions.
Photo: PHOTOSPORT (Ma'a Nonu playing for Toulon).