Niki Xanthou (,, 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. The greatest achievements in her career were the second place in the 1997 World Championships in Athens and the gold medal in 2002 European Indoor Championships in Vienna. She was named the Greek Female Athlete of the Year for 1997.

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