The 2006 Croatia Open Umag was the 17th edition of the Croatia Open Umag men's tennis tournament.

Guillermo Coria was the defending champion but lost in the first round.

Unseeded Stan Wawrinka won his first title of his career after Novak Djokovic retired with breathing problems in the tiebreak of the first set.

Stan Wawrinka defeated Novak Djokovic, 6–6 RET Jaroslav Levinský / David Škoch defeated Guillermo García López / Albert Portas, 6–4, 6–4

This tennis-related competition article is a stub.