Jighinsu is a river in the Iravan uezd of the former Iravan governorate, later in the former Vedi (Ararat) district, and currently in the Ararat province. It was named Jighinsu, as it flows across the Jighin valley.

The hydronym was coined by combining the name of the Turkic Jighin tribe and the word “su” meaning “a river”.