The Dinder River (Arabic: نهر الدندر Nahr-ud-dindir, also spelled Dindar; Amharic: ዲንደር ወንዝ, romanized: dīnideri wenizi) is a tributary of the Blue Nile.

It flows through Ethiopia and Sudan for 784 km (487 mi) based on GIS measurements.

It meanders across the plains to join the Blue Nile near the town of Sennar.

This watershed was previously habitat to the endangered painted hunting dog, Lycaon pictus; however, this canine is thought to be extirpated in the region[2] due to expansion of the human population and lack of attention to conservation.

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