Niki-Katerina Sidiropoulou (born 11 April 1974) is a Greek épée fencer and silver medalist at European Fencing Championships.

As Niké Szidiropulosz, competing with Hungary, Niki-Katerina Sidiropoulou won the silver medal at the World Championships Cadets in 1991 in Foggia, at the Epee Women's U17 Individual event.

[1][2] In 1992 she won the silver medal at the European Championships U20, in Innsbruck, Austria, at the Epee Women's U20 Individual event.

[2][3] In 2002 she won the silver medal at the 2002 European Fencing Championships in Moscow, at the Epee Women's Senior Individual.

This biographical article related to fencing in Greece is a stub.