NTT Docomo, Inc. (Kabushiki gaisha Entītī Dokomo, formerly and still colloquially stylized as NTT DoCoMo until 2008) is a Japanese mobile phone operator. The name is officially an abbreviation of the phrase, "do communications over the mobile network", and is also from a compound word dokomo, meaning "everywhere" in Japanese Docomo provides phone, video phone (FOMA and Some PHS), i-mode (internet), and mail (i-mode mail, Short Mail, and SMS) services. The company's headquarters are in the Sanno Park Tower, Nagatachō, Chiyoda, Tokyo. NTT Docomo is the largest wireless carrier in Japan, with 82.632 million subscribers as of March 2021.

Docomo had been spun off from Nippon Telegraph and Telephone (NTT) in August 1991 to take over the mobile cellular operations, although the parent company had the majority stake until the re-privatization in 2020. It provides 2G (mova) PDC cellular services, 3G (FOMA) W-CDMA, 4G LTE and 5G NR services. Its businesses also included PHS (Paldio), paging, and satellite. Docomo ceased offering a PHS service on January 7, 2008. In late 2020, Docomo was bought back by NTT for about $40 billion.