Daikin Industries, Ltd. (ダイキン工業株式会社, Daikin Kōgyō Kabushiki-gaisha^?) is a Japan-based multinational corporation present in Japan, China, Australia, India, Southeast Asia, Europe, and North America.

The company was founded in 1924 by Akira Yamada in Osaka, Japan. Daikin was founded as a chemical corporation, with a focus on air conditioning systems. It has since diversified its manufacturing division to take advantage of experience in fluorine chemistry. According to Salvatore Re, Daikin's business development manager in Europe, "Fluorochem has a lot to offer this [the fiber-optics] industry. Long term, we aim to develop other materials, such as optical polymers for fibers and components."

Today, Daikin has eight separate industrial and management divisions focusing on the corresponding fields of:

In November 2006 Daikin purchased OYL Industries. This made Daikin the second largest HVAC manufacturer in the world after Carrier Corporation. Daikin codeveloped a R-410A refrigerant with Carrier and is an innovator in the Split System Air Conditioning Market, and is the inventor of Variable Refrigerant Flow (VRF) air conditioning systems (These systems are called Variable Refrigerant Volume or VRV by Daikin). In January 2011, Daikin announced plans to buy Goodman Global at around US $4 billion, which would have made the joint entity surpass United Technologies Corp unit Carrier, however, the plans were put off following the 2011 Tōhoku earthquake and tsunami In 2008 Daikin purchased a 75% share of All World Machinery Supply based out of Harvard, Illinois. Daikin developed the hybrid hydraulic systems using technology from their Air Conditioning division. Facing the global demands on C02 reductions and the serious energy issues facing the world, this product aims to cut energy consumption in the manufacturing sector.