Hello Philippe, it is a Argiope bruennichi.
Argiope bruennichi, or the wasp spider, is a species of orb-web spider distributed throughout central Europe, Northern Europe, north Africa and parts of Asia. Like many other members of the genus Argiope, (including St Andrew's Cross spiders), it shows striking yellow and black markings on its abdomen.
(Information from Wikipedia)
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Photo taken in Schignano, Como, Italy
Misplaced? Suggest new location