Těrlicko Reservoir (Czech: vodní nádrž Těrlicko) is a water reservoir and dam in Těrlicko in the Moravian-Silesian Region of the Czech Republic. It was built on the Stonávka River in 1955–1964 on an area of 2.68 km (1.03 sq mi).

Construction of the dam had major impact on the municipality of Těrlicko. 141 buildings were sunk, including many community buildings and also a church. Těrlicko was eventually transformed into a village with many tourist attractions. Many recreational centres were built. The reservoir is a popular spot for water sports, and is also used to supply water for nearby coal mines and Třinec Iron and Steel Works.