| Mattias Nylund | |
| Fullname: | Mattias Jakob Nylund |
| Birth Date: | 23 September 1980 |
| Birth Place: | Sundsvall, Sweden |
| Position: | Defender |
| Years1: | 1998–2005 |
| Years2: | 2000 |
| Years3: | 2002 |
| Years4: | 2003 |
| Years5: | 2006–2007 |
| Years6: | 2008–2009 |
| Years7: | 2010 |
| Clubs1: | GIF Sundsvall |
| Clubs2: | → SV Ried (loan) |
| Clubs3: | → IFK Timrå (loan) |
| Clubs4: | → AIK (loan) |
| Clubs5: | Aalesunds FK |
| Clubs6: | Trelleborgs FF |
| Clubs7: | GIF Sundsvall |
| Caps1: | 81 |
| Caps2: | 2 |
| Caps3: | 22 |
| Caps4: | 1 |
| Caps5: | 29 |
| Caps6: | 18 |
| Goals1: | 0 |
| Goals2: | 0 |
| Goals3: | 0 |
| Goals4: | 0 |
| Goals5: | 1 |
| Goals6: | 0 |
| Nationalyears1: | 2005 |
| Nationalteam1: | Sweden |
| Nationalcaps1: | 1 |
| Nationalgoals1: | 0 |
| Manageryears1: | 2015 |
| Managerclubs1: | Egersund (assistant) |
| Manageryears2: | 2017–2019 |
| Managerclubs2: | Sundsvalls DFF |
| Manageryears3: | 2019 |
| Managerclubs3: | Timrå |
| Manageryears4: | 2020– |
| Managerclubs4: | Steinkjer |
Mattias Jakob Nylund (born 23 September 1980) is a Swedish former footballer, who now works as head coach at Norwegian 4th division club Steinkjer.
Nylund was a left full back. He played in Trelleborgs FF from the start of 2008, after a transfer from Aalesunds FK. Due to injuries he never got established at Trelleborg and left on a free transfer after the season of 2009. In 2010, he returned to his old club GIF Sundsvall to regain fitness after having done rehab for a cruciate ligament injury. After a few months of training he signed a contract with GIF Sundsvall lasting the rest of the 2010 season.
He has played once for the Sweden men's national football team in 2005.