Iranian President Hassan Rouhani, Russian President Vladimir Putin and Turkish President Recep Tayyip Erdogan are expected to discuss the Syria crisis in the meeting.
Earlier on Friday afternoon, Iranian, Russian and Turkish presidents held mutual talks.
Russian and Turkish presidents arrived in Iran on Tuesday afternoon to attend a trilateral meeting with Iranian president to discuss the Syria crisis.
Rouhani, Putin and Erdogan are to attend a meeting on Friday evening for exchange of views on fighting terrorism and establishing security in Syria.
Tehran summit is held while the Syrian army is preparing to liberate the last major stronghold of terrorist groups in Idlib in northwestern Syria.
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