Jo is a given name, often a short form (hypocorism) of Joanna, Joanne, Joseph, Josephine, George, etc. Notable people with the name include:

Men

• Jô (born 1987), Brazilian footballer, João Alves de Assis Silva
• Jô (footballer, born 1988), Brazilian footballer, Josiel Alves de Oliveira
• Jô (footballer, born 1992), Brazilian footballer, Jonatas Figueira Fernandes
• Jo Jo Benson (1938–2014), stage name of Joseph M. Hewell, American R&B and soul singer
• Jo Inge Berget (born 1990), Norwegian footballer
• Jô Bilac (born 1985), Brazilian playwright
• Jo Bogaert (born 1956), Flemish musician and producer
• Johannes Jo Bonfrère (born 1946), Dutch football player and coach
• Joakim Jo Bonnier (1930–1972), Swedish racing driver
• Johannes Jo van den Broek (1898–1978), Dutch architect
• John Jo Callis (born 1951), British guitarist, notably with The Human League
• Jozef Jo Cals (1914–1971), Dutch Prime Minister
• Jozef Jo Coenen (born 1949), Dutch architect
• Joseph Jo Colruyt (1928 – 1994), Belgian businessman
• Jozef Jo Cornu (born 1944), Belgian business executive
• Josef Jo Gartner (1954–1986), Austrian racing driver
• Johannes Jo van Gastel (1887–1969), Dutch archer
• Jo Grimond (1913-1993), British politician
• Jo de Haan (1936–2006), Dutch cyclist
• Jo Ishiwatari (石渡 譲, born 1967), Japanese actor
• Joseph Jo Johnson (born 1971), British politician, Minister of State for Transport
• Jonathan Jo Jones (1911–1965), American jazz drummer
• Jo Kanazawa (金沢 浄, born 1976), Japanese footballer
• Jo Kondo (近藤 譲, born 1947), Japanese composer and conductor
• Jo Leinen (born 1948), German politician and MEP
• Jo Maas (born 1954), Dutch racing cyclist
• Johannes Jo Meynen (1901–1980), Dutch Ministers of Defence
• Jo Nesbø (born 1960), Norwegian writer, musician, former economist and reporter
• Johannes Jo van Nunen (1945–2010), Dutch engineer and management consultant
• Jo Planckaert (born 1970), Belgian cyclist
• Jo Privat (1919–1996), French accordionist and composer.
• Jozef Jo Ritzen (born 1945), Dutch economist and social-democratic politician
• Johan Jo de Roo (born 1937), Dutch cyclist
• Jô Santos (born 1991), Brazilian footballer, Joálisson Santos Oliveira
• Joseph Jo Schlesser (1928–1968), French racing driver
• Joseph Jo Siffert (1936–1971), Swiss racing driver
• José Jô Soares (1938–2022), Brazilian comedian, talk show host, author and musician
• Joseph Jo Spier (1900–1978), Dutch artist and illustrator
• Johan Jo Vandeurzen (born 1958), Belgian politician, Flemish Minister of Public Health
• Joseph Jo Vonlanthen (born 1942), Swiss racing driver
• Johan Jo Voskuil (1897–1972), Dutch painter, illustrator, and bookbinder
• Johannes Jo Weil (born 1977), German actor

Women

• Joanna Jo Aleh (born 1986), New Zealand sailor, national, world and Olympic champion
• Johanna Jo van Ammers-Küller (1884–1966), Dutch writer
• Joanna Jo Ankier (born 1982), British record holder (1,500-m & 3,000-m steeplechase)
• Jo Archbold, model
• Josephine Jo Armstead (born 1944), American singer-songwriter
• Johanna Jo Bauer-Stumpff (1873–1964), Dutch painter
• Johanna Jo Bonger (1862–1925), Dutch art dealer, sister-in-law of Vincent van Gogh
• Josephine Jo Brand (born 1957), English comedian, writer and actress
• Jo Ann Campbell (born 1938), American singer
• Joanne Jo Coburn (born 1968), BBC political correspondent
• Helen Joanne Jo Cox (1974–2016), British politician
• Johanna Jo Cox-Ladru (1923–?), Dutch Olympic gymnast
• Damita Jo DeBlanc (1930–1998), aka Damita Jo, American actress and singer
• Joanna Jo Durie (born 1960), English tennis player
• Joanne Jo Ellis (born 1983), English field hockey forward
• Joanne Jo Frost (born 1970), English nanny, writer and TV hostess
• Joanne Jo Kiesanowski (born 1979), New Zealand cyclist
• Johanna Jo Konta (born 1991), British tennis player
• Jo Lemaire (born 1956), Belgian singer
• Jo Muir (born 1994), British modern pentathlete
• Jo O'Meara (born 1979), English singer (S Club 7)
• Joanne Jo Pavey (born 1973), British Olympian and distance runner
• Jo Price (born 1985), Welsh rugby union player and former footballer
• Joanne "Jo" J. K. Rowling (born 1965), author of the Harry Potter book series
• Jo Ann Robinson (1912–1990), American civil rights activist
• Johanna Jo Schouwenaar-Franssen (1909–1995), Dutch government minister
• Billie Jo Spears (1937–2011), American country music singer
• Jo Stafford (1917–2008), American singer of traditional pop music
• Jo Van Fleet (1915–1996), American theatre and film actress
• Jo Walton (born 1964), Welsh-Canadian fantasy and science fiction writer and poet
• Joanne Jo Bailey Wells (born 1965), British Anglican bishop, Bishop of Dorking
• Jo Zayner (born 1981), CRISPR engineer

Fictional characters

• Jo Bennett, former CEO of Sabre in the TV show The Office
• Joanne Gardner, lead character from the soap opera Search for Tomorrow
• Jo Grant, a 1971–1973 Dr. Who companion
• Jo Kido, in the anime series Digimon Adventure
• Jo March, in the novel Little Women and its sequels
• Jo Martinez, in the supernatural crime drama series Forever
• Jo Masters, in the British television series The Bill
• Jo Masterson, in ABC Family's Twisted
• Josephine "Jo" McCormick, one of the main characters of the TV series Big Bad Beetleborgs
• Jo Polniaczek, from the TV show The Facts of Life
• Jo Reynolds, in Melrose Place
• Jo Saint-Clair, title character of the French TV series Jo
• Jo Stockton, one of the main characters of the movie Funny Face
• Jo, one of the main characters of anime series Burst Angel
• Jo, a crossing sweeper in Charles Dickens's novel Bleak House
• Jo, a contestant on Total Drama: Revenge of the Island
• Jo Wilson, from ABC's show Grey's Anatomy
• Jo, main character from A Taste of Honey
• Jo, nonbinary bird from Angry Birds introduced in 2023