The Iranian karate fighters won five medals in the competition held in Wroclaw, Poland.
Iran finally secured a gold when Zabiollah Poorshab defeated Japan's Ryutaro Araga in the final of the men's 84kg event.
The bronze medal went to Turkey's Ugur Aktas who beat Kamil Warda from Poland.
Hamideh Abbasali from Iran claimed a silver medal after losing to Japan’s Ayumi Uekusa at the women's over-68 kilograms title at the GEM Sports Complex.
Anne Laure Florentin of France seized the bronze as she overcame Isabela Rodrigues of Brazil.
In the over-84kg, Iran’s Sajad Ganjzadeh lost to Hideyoshi Kagawa from Japan in the gold medal contest.
Poland's Michal Babos sealed a bronze for the host nation after he beat Achraf Ouchen of Morocco.
Aliasghar Asiabari of Iran lost to Stanislav Horuna of Ukraine in the final of the men's 75kg event.
Amir Mehdizadeh had already won a silver medal in the men’s 60kg after losing to Firdosi Farzaliyev from the Azerbaijan Republic.
Japan won the competition with four gold medals, two silvers and one bronze.
France came second, winning two gold and two bronze medals.