Vi or vi most commonly refers to:

• vi (text editor), a screen-oriented text editor software application

VI, Vi, vi, V.I., or v.i. may also refer to:

• Vi (League of Legends), a character from the League of Legends video game franchise
• Vi (Buffy the Vampire Slayer), a minor character in the American TV series Buffy the Vampire Slayer
• Violet Parr, a character of Walt Disney Pictures animated film The Incredibles
• Vi Praskins, a major character in the 1950s American TV series Private Secretary

• Submediant chord, symbolized "VI" or "vi"
• VI (Circle Jerks album), 1987
• VI (The Danse Society album), 2015
• VI (Onslaught album), 2013
• VI (You Me at Six album), 2018
• Ice-T VI: Return of the Real, an album by Ice-T, 1996
• VI Music, a Puerto Rican record label

• Voetbal International, a prominent Dutch football (soccer) magazine
• Vi (magazine), a Swedish lifestyle magazine

• Vodafone Idea, branded as "Vi", a telecom operator based in India
• Vi Senior Living, a provider of retirement communities in the United States
• Victoria Institution, a secondary school in Kuala Lumpur, Malaysia
• The Vinyl Institute, a U.S. industry trade group
• Volga-Dnepr (IATA airline code VI), an airline based in Ulyanovsk, Russia

• Violet (given name), sometimes shortened to Vi
• Vi Anand, Indian film director and screenwriter
• Vi Burnside (1915–1964), American jazz musician
• Vi Daley (born 1943), American politician
• Vi Farrell (1913–1989), English-born New Zealand cricketer
• Vi Gale (1917–2007), Swedish-born American poet and publisher
• Vi Hart (born 1988), "recreational mathemusician" known for creating mathematical YouTube videos
• Vi Hilbert (1918–2008), Native American tribal elder
• Vi Huyền Đắc (1899–1976), Vietnamese playwright
• Vi Jones (born 1998), American football player
• Vi Jordan (1913–1982), Australian politician, second woman elected to the Queensland Legislative Assembly
• Vi June (1932–2020), American politician
• Vi Kaley (1878–1967), British actress
• Vi Keeland, American writer
• Vi Khi Nao, Vietnamese writer
• Vi Lloyd (1923–2013), Australian politician
• Vi Lyles (born 1952), American politician
• Vi Redd (1928–2022), American jazz musician, vocalist and educator
• Vi Simpson (born 1946), American politician
• Vi Subversa (1935–2016), British musician
• Seungri or V.I. (born 1990), member of South Korean pop band Big Bang
• Victoria Imperatrix (Latin for: "Victoria the Empress"), referring to Queen Victoria

• Vi, Sweden
• Vi, a village in Shkodër County, Albania
• Victoria Island, Lagos, an area of Lagos, Nigeria
• British Virgin Islands, by FIPS country code
• United States Virgin Islands, in many code systems including US postal code

• .vi, the country code top-level domain (ccTLD) for the United States Virgin Islands
• Vapor intrusion, a process by which chemicals in soil or groundwater migrate to indoor air above a contaminated site
• Vinyl group, a chemical group with the formula H-C=CH2
• Virtual instrument (disambiguation), a program that implements functions of an instrument by computer, sensors, and actuators
• Viscosity index, a measure of how viscosity of a liquid changes with temperature
• Vulnerability index, a measure of the exposure of a population to some hazard
• Vi, an artificial intelligence personal trainer developed by LifeBEAM
• Vi, from virginium, a rejected proposed name and abbreviation for the element francium

• VI, 6 in Roman numerals
• vide infra, Latin for "see below"
• Visual impairment
• Vietnamese language, by ISO 639-1 code

• V1 (disambiguation) (number "1" as opposed to letter "i")