| Birth Date: | September 20, 1987 |
| Birth Place: | Trenčín, Czechoslovakia |
| Height Ft: | 6 |
| Height In: | 2 |
| Weight Lb: | 187 |
| Position: | Defence |
| Shoots: | Left |
| Played For: | HK Dukla Trenčín HK Nitra Lions de Lyon ŠHK 37 Piešťany |
| Career Start: | 2005 |
| Career End: | 2018 |
Radovan Trefný (born September 20, 1987) is a Slovak former professional ice hockey defenceman.
Trefný played 234 regular season games in the Tipsport Liga for HK Dukla Trenčín, HK Nitra and ŠHK 37 Piešťany. He also played in the Ligue Magnus for Lions de Lyon during the 2014–15 season before returning to Dukla Trenčín on May 25, 2015.[1] He returned to France the following year with Dogs de Cholet of the FFHG Division 1.