Ústa pravdy, Relief sculpture in Lipnice nad Sázavou, Czech Republic.

Ústa pravdy is a nearly 3-metre-high relief carved into the rock face of flooded quarry No. 2, about 1 km west of Lipnice nad Sázavou. Sculptor Radomír Dvořák created it with students of the Lipnice nad Sázavou stone-carving centre, and it was unveiled on 7 September 2006 as part of the National Monument of Eavesdropping.

The sculpture was created by artist Radomír Dvořák and opened on September 7, 2006, as part of a national memorial project about surveillance and wiretapping. The installation emerged from efforts to commemorate a specific chapter in recent political history.

The name and subject are freely inspired by the Bocca della Verità, the mouth relief in the portico of Santa Maria in Cosmedin in Rome. The work is one of five parts of the National Monument of Eavesdropping, alongside Bretschneiderovo ucho, Zlaté oči, Hlava XXII and Jednohubka a la Jurajda. It also appears in the 2020 film Princezna zakletá v čase, directed by Petr Kubík.

The relief stands on the rock wall of flooded quarry No. 2, about 1 km west of Lipnice nad Sázavou. Approach on foot from the town; the final stretch crosses quarry terrain, so wear firm shoes and go in dry weather. The relief is under 3 m high and is seen from the path in front of it.

The relief is one of five components of the National Monument of Eavesdropping, alongside Bretschneiderovo ucho, Zlaté oči, Hlava XXII and Jednohubka a la Jurajda. Visitors often overlook that it also appears in the 2020 film Princezna zakletá v čase, directed by Petr Kubík.