Joni may refer to:
Given name
- Joni Anwar (born 1981), Thai singer and actor
- Joni Eareckson Tada (born 1949), American author and Christian ministry founder
- Joni Ernst (born 1970), American senator from Iowa
- Joni Haverinen (born 1987), Finnish professional ice hockey player
- Joni Isomäki (born 1985), Finnish ice hockey player
- Joni Jaako (born 1986), Swedish sprinter
- Joni James (1930-2022), American singer of traditional pop music
- Joni T. Johnson (1934–1988), American painter
- Joni Liljeblad (born 1989), Finnish ice hockey player
- Joni Mitchell (born 1943), Canadian musician, songwriter, and painter
- Joni Montiel (born 1998), Spanish footballer
- Joni Pitkänen (born 1983), Finnish hockey player
- Joni Robbins (born Joan Eva Rothman), American voice actress
- Joni Sternbach, American photographer
- Joni A. Yoswein (born 1955), New York politician
Nickname
- Joni (footballer) (born 1970), Angolan footballer, real name Osvaldo Roque Gonçalves da Cruz
Others
- Joni (film), a biographical film about Joni Eareckson Tada
- Cyclone Joni, a tropical cyclone named Joni
- Joni's Promise, a film directed by Joko Anwar
- "Joni" (song), a song by SZA featuring Don Toliver from the extended version of Lana (2025)