In the 65kg final, Yazdani lost to Zagir Shakhiev from Russia 14-4.
Hassan Yazdani in the 86kg and Amir Hossein Zare in the 125kg on Sunday won two gold medals for Iran.
Alireza Sarlak also took a silver in the 57kg.
A total of 800 wrestlers from 100 countries are competing at the Wrestling World Championships, being held from October 2 to 10 in Oslo, Norway.