Niki Xanthou (Greek: Νίκη Ξάνθου, [ˈnici ˈksanθu], born 11 October 1973 in Rhodes) is a Greek long jumper.

Xanthou set nine national records in long jump during her career.

Her personal best, and national record, is 7.03 metres, achieved in August 1997 in Bellinzona.

At the age of 22 she gave an impressive performance in the Olympic games final in Atlanta, in which she took the 4th place with 6.97 m. She won the Mediterranean Games of 1997 in Bari and the European under 23 Cup in 1994.

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