Željko Kljajevic (Serbian Cyrillic: ?e??o K?aje???, born 14 September 1984 in Belgrade) is a Serbian-born Montenegrin football defender playing with Aalesunds FK in the Norwegian Tippeligaen.
After playing in the youth squads of FK Jedinstvo Bijelo Polje and Red Star Belgrade, in his career he already represented several clubs from Serbia, namely FK Rad, FK Zvezdara and FK Obilic, Poland, LKS Lódz, Montenegro, FK Mogren, Bosnia and Herzegovina, FK Modrica and Slovenia, NK Maribor.