Jani Nikanor Sievinen (pronounced [ˈjɑni ˈsie̯ʋinen] ^ⓘ; born 31 March 1974) is a former medley swimmer from Finland, who won the silver medal in the 200 m individual medley at the 1996 Summer Olympics in Atlanta, Georgia. In winning the World Championship 200m individual medley title in 1994, he established a new world record of 1:58.16 which lasted for almost nine years until it was broken by Michael Phelps (USA).

Jani Sievinen was married to Mari Sievinen. They have three daughters (born 2008, 2010 and 2013). Sievinen also has two sons (born 1997 and 2001) from his previous marriage to Susanna Sievinen.

• Personal website: www.janisievinen.com Archived 28 May 2014 at the Wayback Machine
• Evans, Hilary; Gjerde, Arild; Heijmans, Jeroen; Mallon, Bill; et al. "Jani Sievinen". Olympics at Sports-Reference.com. Sports Reference LLC. Archived from the original on 7 March 2009.