Harku Lake (Estonian: Harku järv; also known as Haabersti Lake, Loodjärv and Argo Lake) is a 162.9 ha (403 acres) lake on the western border of Tallinn, Estonia. It has an average depth of 1.6 m (5.2 ft) and a maximum depth of 2.5 m (8.2 ft).

Lake's beach is the only lakeside beach in Tallinn. On the beach, there are changing cabins, a shower, children’s playgrounds and ball games areas.

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• List of lakes in Estonia
• Lake Ülemiste, another lake in Tallinn