Gaston Armel "Disney" Mamouma-Ossila (born January 7, 1980) is a retired Congolese football player. FIFA lists his name as Armel Mamouna-Ossila.
Armel began his football career in his native Republic of the Congo with Étoile du Congo, before moving abroad to play professionally in Romania and France. Armel made 50 Liga I appearances, playing for Internaţional Piteşti, Pandurii Târgu Jiu and Farul Constanţa. He made over 50 appearances in Liga II, including loan spells at Internaţional Piteşti and SCM Râmnicu Vâlcea.
He has made several appearances for the Congo national football team. Armel made his debut in a 2006 FIFA World Cup qualifier in June 2004, scoring a goal as Congo defeated Liberia 3–1.