The British comic appeared in character as Admiral General Aladeen outside the Carlton Hotel today (May 16), flanked by female bodyguards in military costume.
Aladeen was photographed posing with a camel, only to later fall off the animal when he tried to ride it.
The Wadiyan tyrant recently appeared on a Saturday Night Live sketch torturing director Martin Scorsese (Cohen worked with the filmmaker on Hugo).
Last week's world premiere in London saw him arrive on the red carpet on a tow truck after his orange Lamborghini had been clamped.
Watch Digital Spy's exclusive Dictator clip below:
The Cannes Film Festival begins today with the premiere of Wes Anderson's Moonrise Kingdom and runs through to May 27.
Robert Pattinson and Kristen Stewart bring their latest films - Cosmopolis and On the Road - to the Croisette, while Brad Pitt's Killing Them Softly and Tom Hardy's Lawless also receive world premieres.
> Cannes Film Festival: 65 years of iconic pictures
> Top 10 Cannes Film Festival 2012 picks
Photo gallery - Cannes Film Festival in pictures: