The Platißbach is a roughly seven-kilometre-long (4.3 mi), southern and orographically right-hand tributary of the River Olef in the municipality of Hellenthal in Germany.

Its source lies about 2.5 kilometres (1.6 mi) northwest of the village of Hollerath and one kilometre (0.6 mi) north of the Belgian border at a height of about 605 m. The Platißbach initially flows in a northern direction.

After about one kilometre (0.6 mi) it collects an unnamed stream from the left and changes direction to head east.

[2] The Platißbach picks up other tributaries from both sides, near Platiß [de; nl] (a district of Hellenthal), the only village it passes, at a height of about 422 m, it is joined by its main tributary, the Prether Bach [de; ce].

In Hellenthal it empties into the Urft tributary, the Olef, at about 403 m. The catchment of the Platißbachs is 38.6 km2 (14.9 sq mi) in area and drains over the Olef, Urft, Rur, Meuse and Hollands Diep into the North Sea.