Joni Nyman (born 5 September 1962 in Pori) is a retired boxer (pugilist) from Finland, who won a Welterweight Bronze medal at the 1984 Summer Olympics. He also competed at the 1988 Summer Olympics in Seoul, South Korea, where he was defeated in the quarterfinals.

1984 – Los Angeles (as a welterweight)

• Round of 64: bye
• Round of 32: Defeated Georges Ngangue (Cameroon) by decision, 5–0
• Round of 16: Defeated Kieran Joyce (Ireland) by decision, 4–1
• Quarterfinal: Defeated Dwight Frazier (Jamaica) by decision, 5–0
• Semifinal: Lost to An Young-Su (South Korea) by decision, 2–3 (was awarded bronze medal)

1988 (as a welterweight)

• Defeated Manny Sobral (Canada) 4–1
• Defeated Søren Antman (Sweden) 5–0
• Defeated Dimus Chisala (Zambia) 5–0
• Lost to Kenneth Gould (United States) 0–5

Known as "Joltin' Joni", Nyman turned pro in 1988 and had limited success. Nyman retired in 1998 and returned in 2005 for one bout, retiring with a 14-6-1 record.

• Boxing record for Joni Nyman from BoxRec (registration required)