the 2005–06 european football season was the 102nd season of sport lisboa e benfica's existence and the club's 72nd consecutive season in the top flight of portuguese football. the season ran from 1 july 2005 to 30 june 2006; benfica competed domestically in the primeira liga and the taça de portugal and also participated in the uefa champions league as a result of finishing first in the primeira liga the previous season.