Relja Dulić Fišer (born 31 December 1975) is a Serbian former professional tennis player.

A left-handed player from Subotica, Dulić Fišer attained a career high singles ranking of 330, competing mostly in ITF Futures/satellite tournaments.

[1] He had a poor record in ITF finals, losing 12 in a row at one point during his career.

Dulić Fišer was a member of the Yugoslavia Davis Cup team in 2000 and 2001.

Appearing in a total of five ties, he won one of his two singles rubbers and was unbeaten in four doubles rubbers, all partnering Janko Tipsarević.