Vizerka, Nature reserve in eastern Prague, Czech Republic.

Vizerka is a 3.09-hectare nature reserve on the northern slope of the Šárecké potok valley, in the Šárka-Lysolaje park between Vokovice and Nebušice. Two outcrops of Proterozoic shale rise above the Vizerka homestead, covered with thermophilous shrubs and dry rock-steppe grassland.

The area received its official protected status in 1988, becoming an important location for preserving nature within the city. This designation marked a turning point that ensured the long-term security of the area against urban development.

The name Vizerka comes from the homestead of the same name below the slopes, whose owner still runs a summer refreshment stand on part of the land. The rare red spider Eresus kollari has been recorded here several times, and the pasqueflower Pulsatilla pratensis can be found each year as a single specimen among the rocks.

Vizerka lies on the northern slope of the Šárecký potok valley, between Vokovice and Nebušice, at 236–285 m above sea level. Part of the land belongs to the owner of the Vizerka homestead, who runs a refreshment stand there in summer. Houses built on one side to block access instead led to litter accumulating in the reserve.

The rare spider Eresus kollari, the ladybird spider, has been recorded here several times, a sign of the site's arachnological value. The reserve also shelters the smooth snake on its rocky steppe and the sand lizard, which basks on the small crags.