Tajik President Emomali Rahmon has congratulated Hassan Rohani over his victory in Iran's June 14 presidential election, Press TV reported.
In his message, which was issued on Monday, Rahmon wished the president-elect success.
He praised the relations between Dushanbe and Tehran and expressed hope that the two countries with cultural, historical, and linguistic affinities would expand their ties in various areas during the new Iranian president's term in office.
Italian President Giorgio Napolitano also congratulated Rohani over his election victory on Monday and said efforts should be made to strengthen Iran-Italy relations.
In addition, on Monday, Organization of Islamic Cooperation Secretary General Ekmeleddin Ihsanoglu congratulated Rohani on his victory in the June 14 presidential poll and wished him success.
He expressed optimism that ties between the 57-member organization and Iran would improve under President-elect Hassan Rohani and that Tehran would begin to play a more active and influential role in the OIC.
"Iran is one of the OIC's founding members and an active member of the organization," Ihsanoglu stated.
Leaders of Persian Gulf Arab countries have also issued separate messages congratulating Rohani on his victory in the election.
Nearly 50.5 million Iranians, including more than 1.6 million first-time voters, were eligible to participate in the June 14 presidential election. The Interior Ministry put the voter turnout at 72.7 percent.
Rohani won 50.7 percent of the vote to secure an outright victory. In the Iranian system, if no presidential candidate receives 50 percent of the vote, the two top candidates must face off in a run-off election.
Rohani currently represents Leader of the Islamic Revolution Ayatollah Seyyed Ali Khamenei in the Supreme National Security Council and is also a member of the Expediency Council and the Assembly of Experts. He is also the director of the Expediency Council's Center for Strategic Research.
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