Yamaha Motor Co., Ltd. (ヤマハ発動機株式会社, Yamaha Hatsudōki Kabushiki-gaisha) is a Japanese multinational manufacturer of motorcycles, marine products such as boats and outboard motors, and other motorized products. The company was established in 1955 upon separation from Yamaha Corporation (however, Yamaha Corporation is still the largest private company shareholder with 9.92%, as of 2019), and is headquartered in Iwata, Shizuoka, Japan. The company conducts development, production and marketing operations through 109 consolidated subsidiaries as of 2012.

Led by Genichi Kawakami, the company's founder and first president, Yamaha Motor spun off from musical instrument manufacturer Yamaha Corporation in 1955 and began production of its first product, the YA-1 125cc motorcycle. It was quickly successful and won the 3rd Mount Fuji Ascent Race in its class.

The company's products include motorcycles, scooters, motorized bicycles, boats, sail boats, personal water craft, swimming pools, utility boats, fishing boats, outboard motors, 4-wheel ATVs, recreational off-road vehicles, go-kart engines, golf carts, multi-purpose engines, electrical generators, water pumps, snowmobiles, small snow throwers, automobile engines, surface mounters, intelligent machinery, industrial-use unmanned helicopters, electrical power units for wheelchairs and helmets. The company is also involved in the import and sales of various types of products, development of tourist businesses and management of leisure, recreational facilities and related services. Yamaha's motorcycle sales are the second largest in the world and Yamaha is the world leader in water vehicle sales.