| Fullname: | Abdellah Medjadi Liegeon |
| Birth Date: | 1957 12, df=yes |
| Birth Place: | Oran, Algeria |
| Height: | 1.75 m |
| Position: | Right-back |
| Youthyears1: | 1972–1975 |
| Youthclubs1: | Lons-le-Saunier |
| Years1: | 1975–1981 |
| Clubs1: | Besançon |
| Caps1: | ? |
| Goals1: | ? |
| Years2: | 1981–1987 |
| Clubs2: | Monaco |
| Caps2: | 114 |
| Goals2: | 4 |
| Years3: | 1987–1989 |
| Clubs3: | Strasbourg |
| Caps3: | 36 |
| Goals3: | 1 |
| Nationalyears1: | 1982–1986 |
| Nationalteam1: | Algeria |
| Nationalcaps1: | 5 |
| Nationalgoals1: | 0 |
Abdellah Medjadi Liegeon (born 13 December 1957) is an Algerian former footballer who played as a right-back for the Algeria national team.
Born in Oran, Algeria, Liegeon spent his career in France, playing with Besançon RC, AS Monaco and RC Strasbourg and was part of Algeria's team at the 1986 FIFA World Cup, where his defensive mistake allowed Brazil's Careca to score the only goal of the game in the two countries' first-round encounter.
Monaco