Údolí Únětického potoka, Nature reserve in Praha-Suchdol, Czech Republic.

Údolí Únětického potoka is a nature reserve near Prague with forests, meadows, rocky slopes, and stream valleys that provide habitat for diverse plant and animal species. The area covers about 63 hectares and features different geological formations ranging from slate to resistant mineral rocks.

The protected area was formally established in 1988 and recognizes the region's geological past shaped by ancient marine activity. These sea cycles left different rock types and created the foundation for today's landscape.

The name Únětický potok comes from the village of Únětice, whose Bronze Age culture left a hoard of bronze daggers beneath the Kozí hřbety ridges. A trade route called Via magna ran from Hradčany through Suchdol and Únětice toward Byzantium, and a land path from Levý Hradec joined it at Trojanův mlýn.

The reserve lies on the northwestern edge of Prague in Suchdol, along the border with Únětice and Roztoky, and is managed by the Prague City Hall. The valley takes the form of a gorge, with the Kozí hřbety chert outcrops rising in its western part. The Roztocký háj – Tiché údolí reserve adjoins it to the northeast on Roztoky territory.

The reserve holds 1,132 recorded butterfly species, among the most surveyed groups alongside beetles of the ground, leaf and weevil families. Relict steppe beetles also survive here. The white willow called Vrba zapomenutá, at the confluence of the Únětický and Horoměřický streams, was declared a notable tree on 28 October 2014.