Cannes film festival president Iris Knobloch and town mayor David Lisnard led a ceremony on the beach in the shadow of the Majestic hotel where Bardot regularly stayed when she was still making movies.
Bardot died at her St Tropez home in December aged 91 and French Riviera resorts have since paid a number of tributes.
Cannes renamed its Mace beach after the film star.
The town hall said that dogs will be allowed on the beach, which is close to the Palais des Festivals where the film extravanza is held, at set times each day.
Nice, along the coast, has also named a beach after Bardot and opened it up to dogs in a gesture to the late star who took up animal causes, and started speaking up for France's far right, when she turned her back on the cinema in the 1970s.
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