| Valtteri Viljanen | |
| Team: | HC Ässät Pori |
| League: | Liiga |
| Former Teams: | Ilves Vaasan Sport Rögle BK |
| Position: | Defence |
| Height Ft: | 5 |
| Height In: | 8 |
| Weight Lb: | 163 |
| Shoots: | Right |
| Birth Date: | 3 March 1994 |
| Birth Place: | Pori, Finland |
| Career Start: | 2014 |
Valtteri Viljanen (born March 3, 1994) is a Finnish professional ice hockey defenceman. He is currently playing with HC Ässät Pori in the Liiga.
Viljanen made his Liiga debut playing with Pori Ässät during the 2014–15 Liiga season.[1]