The Nippon Telegraph and Telephone Corporation (NTT) is a Japanese telecommunications holding company headquartered in Tokyo, Japan. Ranked 55th in Fortune Global 500, NTT is the fourth largest telecommunications company in the world in terms of revenue, as well as the third largest publicly traded company in Japan after Toyota and Sony, as of June 2022. In 2023, the company was ranked 56th in the Forbes Global 2000.

NTT Communications Corporation is a Japanese telecommunications company owned by Nippon Telegraph and Telephone Corporation. It operates an international network across over 190 countries and regions, with locations in more than 70 countries and regions. The company has approximately 5,500 employees as of March 2020. Its headquarters are located in the Otemachi Place West tower, Otemachi, Chiyoda, Tokyo.