Turkey's Energy Minister Taner Yildiz said oil trade with Iran would continue and added that the United Nations' sanctions imposed no restrictions on energy trade with Iran.
"Turkey is doing (oil trade with Iran) through the private sector and this trade is currently continuing... I think that trade can continue as there is no UN Security Council decision now," Reuters quoted Yildiz telling reporters.
Since June, the UN Security Council, the United States and the European Union have tightened sanctions on Iran over its refusal to enter into international talks on its nuclear programme, which Washington fears is a cover to build weapons but Tehran says is for the generation of electricity.
Turkey and Brazil brokered a deal in May for a nuclear fuel swap in Tehran, hoping that this would draw Iran and major powers back to the negotiating table.
Iran is Turkey's second-biggest gas supplier after Russia with annual purchases around 10 billion cubic metres.
Yildiz also said Turkey may purchase gas from Turkmenistan and was in talks with the Turkmen authorities.
"They have 5.5 billion cubic metres exploitable gas reserves at the Caspian Sea and I have told them that we may be interested in this," Yildiz said.