Yazyurdsu is a river in the Sharur-Daralayaz uezd of the former Iravan governorate, later in the former Keshishkend (Yeghegnadzor) district, and currently in the Vayots Dzor province.

The hydronym was coined by combining the Turkic words “yazi meaning “a lowland”, “yurd” meaning “a dwelling place, a house, a camp, the birthplace” and “su” meaning “a river”.