According to the report, the total value of transactions between Iran and Turkey in the first 10 months of 2018 stood at $8.252 billion, showing a 10-percent decline compared to the figure for the same period last year, Tasnim News Agency reported.
Trade between the two neighbors from from January to October 2017 stood at $9.199 billion, according to the data.
Turkey's exports to Iran in the first 10 months of 2018 have also decreased by 22 percent compared to the amount for the same period in 2017, the report said.
Iran ranked 20th on the list of Turkey's top export destinations and the seventh major source of imports to Turkey in the first 10 months of 2018.
Iran and Turkey have set a $30-billion annual trade target, signing several agreements to enhance cooperation in various areas.
In October 2017, Turkish President Recep Tayyip Erdoğan visited Iran to take part in fourth round of strategic meetings between Iran and Turkey.