Nikkei can refer to:
- , abbreviated , Nikkei, a large media corporation in Japan
- , abbreviated , Nikkei, a major business newspaper published in Japan
- , a Japanese stock market index, published by the Nihon Keizai Shimbun
- Nikkei cuisine, a Japanese Peruvian fusion cuisine that was created by the Japanese immigrants that came to Peru
- , often simply Nikkei, people in the Japanese diaspora
- , a Japanese-language newspaper published in São Paulo, Brazil