Sumi may refer to:
People
- Sumi Sen (born 1999), South Korean soprano
- Sumi Jo (born 1962), South Korean lyric coloratura soprano
- Sumi, an honorific for Buddhist monks
Cultures
- The Sumi Naga, one of the major Naga tribes in Nagaland, India
- The Sumi language spoken by the Sumi Naga
Sport
- Sumi, of Miga, Quatchi, Sumi and Mukmuk, the mascots of the 2010 Winter Olympics and Paralympics
- Sumi gaeshi, one of the 40 original throws in Judo
Other uses
- Inkstick or Sumi ink, Japanese solid ink
- Ink wash painting or Sumi-e, Japanese ink wash painting
- Software Usability Measurement Inventory (SUMI), a questionnaire for assessing quality of use of software by end users