Tim Mastnak
| Personal information | |
|---|---|
| Nationality | Slovenian | 
| Born | 31 January 1991 Celje, SR Slovenia, SFR Yugoslavia  | 
| Height | 1.77 m (5 ft 10 in) | 
| Sport | |
| Country | Slovenia | 
| Sport | Snowboarding | 
| Event | Parallel giant slalom | 
| Club | Sport Klub M-Celje | 
| Coached by | Robert Mastnak | 
Tim Mastnak (born 31 January 1991) is a Slovenian snowboarder.
He competed in the 2015 and 2017 FIS Snowboard World Championships, and at the 2018 Winter Olympics, in parallel giant slalom.