Naizin (; ) is a former commune in the Morbihan department of Brittany in north-western France. It is the seat of the commune of ÃÂvellys. Inhabitants of Naizin are called in French Naizinois.
On 1 January 2016, Moustoir-Remungol, Naizin and Remungol merged becoming one commune of ÃÂvellys.
The river ÃÂvel forms most of the commune's southern border.