| Mathias Jänisch | |
| Birth Date: | 27 August 1990 |
| Birth Place: | Riedlingen, West Germany |
| Position: | Midfielder |
| Currentclub: | UN Käerjéng |
| Clubnumber: | 19 |
| Youthclubs1: | TSV Dettingen-Wallhausen |
| Youthyears2: | 1995–2006 |
| Youthclubs2: | SC Bettembourg[1] |
| Youthyears3: | 2006–2007 |
| Youthclubs3: | US Hostert[2] |
| Years1: | 2007–2009 |
| Clubs1: | CS Grevenmacher |
| Caps1: | 37 |
| Goals1: | 2 |
| Years2: | 2009–2019 |
| Clubs2: | Differdange 03 |
| Caps2: | 225 |
| Goals2: | 21 |
| Years3: | 2020–2022 |
| Clubs3: | Progrès Niederkorn |
| Caps3: | 32 |
| Goals3: | 1 |
| Years4: | 2022– |
| Clubs4: | UN Käerjéng |
| Caps4: | 35 |
| Goals4: | 2 |
| Nationalteam1: | Luxembourg U21 |
| Nationalyears2: | 2009– |
| Nationalteam2: | Luxembourg |
| Nationalcaps2: | 59 |
| Nationalgoals2: | 1 |
| Club-Update: | 1 June 2024 |
| Ntupdate: | 21:54, 15 November 2018 (UTC) |
Mathias Jänisch (born 27 August 1990) is a Luxembourger international footballer who plays club football for UN Käerjéng, as a midfielder.[1]
Born in Riedlingen, West Germany, Jänisch has played club football for CS Grevenmacher and FC Differdange 03.
He made his international debut for Luxembourg in 2009.