Jani Nikanor Sievinen ( pronunciation ; born 31 March 1974 in Vihti) 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.
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.