Kristof Vliegen (born 22 June 1982) is a Belgian former tennis player.

He was also the 30th seed at the 2006 Wimbledon Championships, where he reached the 2nd round before losing to Nicolas Mahut in straight sets.

At the Australian open he met Italian Simone Bolelli but lost in three long sets 6–7, 5–7 and 6–7.

In the quarterfinals he lost to world number 6 Jo-Wilfried Tsonga in straight sets 4–6 and 1–6.

At the Open 13 in Marseille he faced Czech Jan Hernych in the first round but lost in three sets: 6–3, 3–6 and 6–4.