Slezská Harta Reservoir (Czech: Vodní nádrž Slezská Harta) is an artificial reservoir and a rock-fill embankment dam in the Nízký Jeseník mountain range, Moravian-Silesian Region, Czech Republic.

Today only Church of Saint John of Nepomuk and several other abandoned buildings remain at the reservoir's shore.

[1] Villages of Dlouhá Stráň, Nová Pláň, Razová, Roudno and Leskovec nad Moravicí were also partially flooded and are today located on the shore of the reservoir.

The main use of the reservoir is to supply enough water in case of unfavorable conditions to the Kružberk reservoir, which supplies drinking water for the Ostrava agglomeration, and is located downstream on the Moravice River.

It is also used to supply process water to the nearby towns and villages, generate electricity and subdue floods on the Moravice.