Brno Reservoir, Water reservoir in Brno-Bystrc and Brno-Kníničky, Czech Republic.

Brno Reservoir is a reservoir on the Svratka River at the northwest edge of Brno, held back by a concrete gravity dam 120 m long and 7.14 m wide at its crown, rising 23.5 m above the river bed. Its flooded area covers 259 ha, and the water stretches nearly 10 km from the dam to the weir at Tejkalův Mill in Veverská Bítýška.

A dam on the Svratka was proposed at the start of the 20th century but built only in 1936–1940, funded by the Ministry of Public Works with a 25% share from Země Moravskoslezská. Flooding the valley drowned the village of Kníničky. In 1945 dam keeper František Šikula had the demolition piping sealed with stone and concrete, then warned the Red Army of German mines and was shot and wounded; a plaque at the dam honours him.

Locals call the reservoir Prýgl in Hantec slang, while its older name, Kníničky Reservoir, recalls the village flooded during construction. The international firework competition Ignis Brunensis is held over the Bystrc section each year in late May and early June, and the film Osmy was shot here.

Boats leave from Bystrc harbour (Přístaviště) every 45 minutes, running to Veveří Castle and sometimes on to Veverská Bítýška depending on the water level; tickets are sold at the harbour ticket office. The reservoir is served by trams 1, 3 and 10, and bus line 303 follows the right bank along road II/384. The dam lies on the border of Brno-Bystrc and Brno-Kníničky.

The Kníničky hydroelectric plant in the dam runs a single Kaplan turbine with an output of 2.88 MW. If the plant is cut off from the grid, the turbine can start a gas combustion turbine at the Červený mlýn heating plant.