The move follows comments by Philippe Moreau Defarges about the outcome of the April 16 referendum on controversial constitutional changes that will tighten the president's grip on power.
Defarges, now a senior fellow at the French Institute of International Relations, said all legal paths to challenge Erdogan had been shut off and that the only two options left were civil war or assassination.
The 'Yes' camp won just over 51 per cent in the vote, a narrower-than-expected victory, but Turkey's top election board last week rejected opposition calls to annul the referendum after complaints of vote-rigging.
"There will either be a civil war or another scenario... his assassination," he said.
Huseyin Aydin, a lawyer representing Erdogan, said in a petition to an Ankara prosecutor that the comments were not a simple expression of opinion, but were "clearly instigating the crime in question".
He said the comments showed how far the hostility against Erdogan had reached in the West, and suggested Defarges should undergo checks for his mental health if he ever came to Turkey.
"And if he is in good health mentally, his alleged links with the outlawed Kurdistan Workers' Party (PKK) or US-based Muslim cleric Fethullah Gulen blamed by the Turkish government for orchestrating the failed July coup should be investigated."
"Former French diplomat openly calls for assassination of President Erdogan. @IFRI_ should terminate his fellowship, apologise," Gulnur Aybet wrote on Twitter.
"What would be the reaction if a former diplomat&senior fellow at a Turkish think tank called for the assassination of the French President?"
Defarges yesterday offered his "sincere apologies" for his remarks.
"Some of what I said was clumsy and might have been wrongly interpreted," he said on Twitter.
Critics say the constitutional changes will lead to one- man rule in NATO member Turkey.
There have been a number of prosecutions for insulting Erdogan, with artists, journalists and schoolchildren all targeted.
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