Niyodogawa (仁淀川町, Niyodogawa-chō) is a town located in Agawa District, Kōchi Prefecture, Japan.

Niyodogawa is located in the Shikoku Mountains of north-central Kōchi Prefecture on the upper reaches of the Niyodo River.

[2] Per Japanese census data,[3] the population of Niyodogawa has decreased precipitously since the 1950s and is now less than a quarter of what it was a century ago.

During the Edo period, the area was part of the holdings of Tosa Domain ruled by the Yamauchi clan from their seat at Kōchi Castle.

Following the Meiji restoration, the village of Ikegawa was established within Agawa District, Kōchi with the creation of the modern municipalities system on October 1, 1889.

Niyodogawa has a mayor-council form of government with a directly elected mayor and a unicameral town council of five members.

In terms of national politics, the town is part of Kōchi 2nd district of the lower house of the Diet of Japan.