Hartbeespoort Dam also known as Harties (officially the Hartbeespoort Dam Reservoir) is a dam situated in the North West Province of South Africa. It lies in a valley to the south of the Magaliesberg mountain range and north of the Witwatersberg mountain range, about 35 kilometres west of Pretoria. It is situated in the Hartbeespoort Dam Nature Reserve.
The dam is 149.5 metres long and 59.4 metres and is built across a gorge cutting through the Magaliesberg. The reservoir is fed by the waters of the Crocodile River and Magalies River and covers approximately 18.83 square kilometres, with a mean depth of 9.6 metres and maximum depth of 45.1 metres.
Hartbeespoort has become a very popular holiday and weekend resort for the inhabitants of Johannesburg and Pretoria, it is the principal water recreation area of northern Gauteng and many types of water sports are practiced on the dam.