| Position: | Defender |
| Height Ft: | 6 |
| Height In: | 2 |
| Weight Lb: | 194 |
| Played For: | Tappara HPK JYP Jyväskylä Espoo Blues |
| Birth Date: | 1988 3, df=yes |
| Birth Place: | Helsinki, Finland |
| Draft: | 170th overall |
| Draft Year: | 2007 |
| Draft Team: | Minnesota Wild |
| Career Start: | 2007 |
| Career End: | 2013 |
Harri Ilvonen (born 11 November 1988) is a Finnish former professional ice hockey defenseman who played in his country's top tier Liiga.
Ilvonen made his first appearances for Tappara during the 2006–07 season. After a promising rookie year, he was selected by the Minnesota Wild in the sixth-round, 170th overall, in the 2007 NHL Entry Draft. In the spring of 2008 he had a brief stint with HPK before returning to Tappara for the next season.
Ilvonen was never signed by the Wild and remained in Finland for the entirety of his professional career, finishing with the Espoo Blues in the 2012–13 season. Having ended his career playing in 204 Liiga games, Ilvonen later returned to Tappara in a coaching capacity, accepting an assistant coaching role with their under-18 youth team from the 2015–16 season.