| Roger Janssen | |
| Nickname: | "Gizmo" |
| Birth Date: | 21 April 1977 |
| Birth Place: | Antwerp, Belgium |
| Hometown: | Leopoldsburg, Belgium |
| Since: | 1997 |
| Darts: | 25g |
| Laterality: | Right-handed |
| Music: | "It's a Sin" by Pet Shop Boys |
| Bdo: | 2012–2019 |
| Bdo World: | Last 32: 2019 |
| World Masters: | Last 32: 2018 |
| World Darts Trophy: | Quarter Final: 2019 |
Roger Janssen (born 21 April 1977) is a Belgian former professional darts player who played in British Darts Organisation (BDO) events.
Janssen's career began with the 2012 Belgium Open, in which he finished among the Last 64. Since then he has competed in various other competitions, getting to several quarter and semi finals. His, so far, only win was in the 2015 Hal Masters where he beat Martin Adams 3–2.[1]