Abdellah Medjadi Liegeon (born 13 December 1957) is a former footballer who played as a right-back. 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.