The Ygyatta (, ; , Igñatta) is a river in Sakha, Russia. It is a left tributary of the Vilyuy. The Ygyatta is long, and its basin covers about . The of the river at its mouth is near . It rises on the Vilyuy Plateau in the west of Sakha and is fed by rain and snowmelt.
The river and its banks are rich with gems: emeralds, rubies, sards, aquamarines, and others.
There are goldfields along the river.
The basin of the Ygyatta is among the least populated places within Russia.