Tatiana Kovalchuk (born 24 July 1979) is a former professional tennis player from Ukraine.

Kovalchuk was 16 years of age when she began playing Fed Cup tennis for Ukraine in 1996.

She was beaten in the first round of the singles at both events but was a doubles quarter-finalist in Antwerp's Belgian Open.

She made it through the qualifying competition by beating Yuka Yoshida, Conchita Martínez Granados and Gréta Arn, then lost to Anne Kremer in the first round.

She made the last of her 11 Fed Cup tie appearances in 2001, ending her representative career by beating Estonia's Kaia Kanepi.