The reason for the postponement has not been reported, diplomatic sources told.
Representatives of the three countries' foreign ministries met in Tehran on 29 November agree the agenda for the meeting.
The last meeting of the three foreign ministers took place in Urmia, Iran, in April.
They signed the Urmia declaration which contains provisions on economic development, the expansion of ties in tourism, science and culture, interaction in regional and international organizations, resolution of conflicts within the framework of the territorial integrity of states and the inviolability of borders and the principles for the establishment of trilateral cooperation in other spheres.
The first trilateral meeting of the three foreign ministers was held in Istanbul in early 2011.
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