Kouassia-Niaguini (also spelled Kouassianiaguéné) is a town in the far east of Ivory Coast. It is a sub-prefecture of Transua Department in Gontougo Region, Zanzan District.
Kouassia-Nigaguini was a commune until March 2012, when it became one of 1,126 communes nationwide that were abolished.
In 2014, the population of the sub-prefecture of Kouassia-Niaguini was 16,872.
The thirteen villages of the sub-prefecture of Kouassia-Niaguini and their population in 2014 are: