Air Liquide S.A., is a French multinational company whichsupplies industrial gases and services to various industries including medical,chemical and electronic manufacturers. 

Founded in 1902, after Linde it is thesecond largest supplier of industrial gases by revenues and has operations inover 80 countries. It has headquarters at the 7th arrondissement of Paris,France. Air Liquide owned the patent for Aqua-Lung until it expired.AlthoughAir Liquide's headquarters are in Paris, France, it also has major sites inJapan (ALL) and Houston, TX and Newark, DE, USA, Frankfurt, Shanghai and Dubaï. 

There is an emphasis on research and development (R&D) throughout the AirLiquide company. R&D targets the creation of not only industrial gases, butalso gases that are used in products such as healthcare items, electronicchips, foods, and chemicals. The major R&D groups within Air Liquide focuson analysis, bioresources (foods and chemicals), combustion, membranes,modeling, and the production of hydrogen (H2) gas.

The company is a component ofthe Euro Stoxx 50 stock market index.[4] As of 2019, the company is ranked 500in the Fortune Global 500.[5]