Kaagjärve () is a village in Valga Parish, Valga County, in southeastern Estonia, located about 9 km east of the border town Valga. (retrieved 28 July 2021) As of the 2011 census, the settlement's population was 246.

The currently inactive Valga–Pechory railway passes Kaagjärve on its northern side, and there is a station named Ratsimäe.

Painter Eduard Ole (1898–1995), was born in Kaagjärve.

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