| Petri Viljanen | |
| Height: | 1.830NaN0 |
| Birth Date: | 1987 2, df=yes |
| Birth Place: | Pori, Finland |
| Position: | Defender |
| Youthyears1: | –1999 |
| Youthclubs1: | TOVE |
| Youthyears2: | 2000–2004 |
| Youthclubs2: | FC Jazz |
| Years1: | 2005 |
| Years2: | 2006–2009 |
| Years3: | 2010–2011 |
| Years4: | 2012 |
| Clubs1: | FC PoPa |
| Clubs2: | FC Haka |
| Clubs3: | FC PoPa |
| Clubs4: | TOVE |
| Caps1: | 69 |
| Caps2: | 70 |
| Goals1: | 0 |
| Goals2: | 0 |
| Caps3: | 41 |
| Caps4: | 3 |
| Goals3: | 3 |
| Goals4: | 0 |
| Nationalyears1: | 2007–2009 |
| Nationalteam1: | Finland U-21 |
| Nationalcaps1: | 4 |
| Nationalgoals1: | 0 |
| Pcupdate: | 30 July 2014 |
Petri Viljanen is a Finnish football referee and retired football player.
He played four seasons in the Finnish top division Veikkausliiga and won the Finnish Cup with his side FC Haka in 2005. Viljanen was a member of the Finnish squad in the 2009 UEFA U-21 Championship.
Viljanen made his Finnish premier division debut in June 2014 by officiating the match between FC Inter and MYPA.[1] In July he was nominated as one of the referees of the 2014 Nordic Under-17 Football Championship in Denmark.[2]