Nej
Jag har varit genom IST flera gånger, de kommer att kontrollera ditt pass i säkerhet men ingen turkisk visa krävs.
Från IST-webbplatsen
Transfer Passengers:(International Transfer Passengers With An International Connection Flight) A boarding card is issued for the passenger (if not issued in the country of origin) at the transit desk of the relevant handling company on the Arrivals floor. The passenger does not go through passport control. Instead, he/she directly proceeds through the transit area into the International Departures area. Baggage will be automatically transferred to the connecting flight.