The Nikkei, also known as The Nihon Keizai Shimbun , is the flagship publication of Nikkei, Inc. and the world's largest financial newspaper, with a daily circulation exceeding 1.73 million copies. The Nikkei 225, a stock market index for the Tokyo Stock Exchange, has been calculated by the newspaper since 1950.

Nikkei, Inc. is a Japanese media company which owns The Nikkei and the Financial Times. Its first publication was in 1876 with the publication of The Chugai Bukka Shimpo . In 1946, the company name was changed to Nihon Keizai Shimbunsha, while the newspaper changed its title to the Nihon Keizai Shimbun, both of which were later shortened to Nikkei.