' (), also known as Nikon or Nikon Corp.', is a multinational corporation headquartered in Tokyo, Japan specializing in optics and imaging. Its products include cameras, binoculars, microscopes, measurement instruments, and the steppers used in the photolithography steps of semiconductor fabrication. It was founded in 1917 as Nippon K?gaku K?gy? (?????????? "Japan Optical Industries"); the company was renamed Nikon Corporation, after its cameras, in 1988. Nikon is one of the major companies of the Mitsubishi Group.

The name Nikon, which dates from 1946, is a merging of Nippon K?gaku (????: "Japan Optical") and an imitation of Zeiss Ikon. Nikon is pronounced differently around the world. The Japanese pronunciation of the name is , but in the United States people also use and .Discussion of pronunciation at dpreview.com

Among its famous products are Nikkor imaging lenses (for F-mount cameras, large format photography, photographic enlargers, and other applications), the Nikon F-series of 135 film SLR cameras, the Nikon D-series of digital SLR cameras, and the Nikonos series of underwater cameras.

Nikons main competitors include Canon, Casio, Kodak, Sony, Pentax, Panasonic, Fujifilm and Olympus. Currently, Nikon's only competitor in high-end camera systems is Canon.

Nikon is the world's second largest manufacturer of steppers.List op top IC equipment suppliers 2007