Kuldar Sikk (born 20 June 1979) is an Estonian rally co-driver.

[2] Sikk holds the record for the best overall result in a car class in the Baltics as well as for an Estonian co-driver.

In the 2003 Monte Carlo Rally, he made his WRC debut in a Suzuki Ignis S1600.

[3] From 2010, Sikk became the co-driver of the rising star Ott Tänak.

[4] Two years later, in the 2012 Rally Sweden, the Estonian crew took their first stage win on SS14.