According to the infamous Wikipedia, Father's Day is celebrated in nearly 100 countries--including Iran. Although I think this year's homage to dear ol' dad was postponed (18 June 09).
Not every country celebrates Father's Day on the 3rd Sunday in June. So there's still time to plan that father-son expedition up Mount Everest! (Nepal--18 September 09).
In Bulgaria Father's Day falls on 26 December. Oh boy! Twice as many neckties!