JCDecaux Group (JCDecaux SA, French pronunciation: ​[ʒisedəˈko]) is a multinational corporation based in Neuilly-sur-Seine, Paris, France, known for its bus-stop advertising systems, billboards, public bicycle rental systems, and street furniture. It is the largest outdoor advertising corporation in the world.

The company was founded in 1964 in Lyon, France by Jean-Claude Decaux. Over the years it has expanded aggressively, partly through acquisitions of smaller advertising companies in several countries. It currently operates in more than 54 countries, 165 airports and has approximately 9940 employees; its advertising reaches 175 million people each day. Its headquarters is located in Neuilly-sur-Seine, a suburb of Paris, France. JCDecaux currently employs more than 12,300 people worldwide and maintains a presence in over 70 countries. In France alone, JCDecaux employs more than 3,500 people.