Seiko Group Corporation commonly known as Seiko Japanese, is a Japanese maker of watches, clocks, electronic devices, semiconductors, jewelry, and optical products. Founded in 1881 by Kintarō Hattori in Tokyo, Seiko introduced the world's first commercial quartz wristwatch in 1969.

Seiko is widely known for its wristwatches.[6] Seiko, Citizen and Rolex are the only three watch companies considered to be vertically integrated.[7] Seiko is able to design and develop all the components of a watch, as well as assemble, adjust, inspect and ship them in-house. Seiko's mechanical watches consist of approximately 200 parts, and the company has the technology and production facilities to design and manufacture all of these parts in-house.