Before taking their places on the Cannes jury, the pair will form half of a four-strong panel that will judge a preliminary round to select the best UK entries to go through to the judging in Cannes.
The other members of the preliminary judging panel are Danny Kellard, international creative director at Publicis Dialog Group, and Steve Aldridge, creative partner at Partners Andrews Aldridge.
The selection follows November's appointment of Austrian Fred Koblinger, chief executive of BBDO Holding and managing director of Palla Koblinger Proximity, to head the jury.
Terry Savage, CEO of the International Advertising Festival, said: "We have some great creative talent and personalities representing the UK this year."
Levy is executive creative director at Joshua and Nimick is creative director at OgilvyOne.
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