The Tatta (Russian: Татта; Yakut: Таатта, Taatta) is a river in the Sakha Republic (Yakutia), Russia, a left tributary of the Aldan, part of the Lena basin.

[1] There are many inhabited places close to the banks of the Tatta, especially in its upper and middle reaches, including Churapcha and Ytyk-Kyuyol towns, as well as Uolba, Bulun, Dyabyla, Kharbala 1st, Kharbala 2nd, Cherkyokh, Borobul and Tolon villages.

[2] The Tatta originates in the eastern slopes of the Lena Plateau and is the 7th longest tributary of the Aldan.

It flows roughly northwards across a wide, flat valley marked by permafrost and thermokarst zones.

[2] The Tatta meets the left side of the Aldan very near the mouth of the Baray on the facing bank, 271 km (168 mi) from its confluence with the Lena.