César Augusto Ramírez Caje (born 24 March 1977), nicknamed El Tigre (Tiger), is a Paraguayan retired footballer who played as a forward.
He spent most of his professional career with Cerro Porteño (two spells, nine seasons in total), but also competed in Argentina and Portugal.
In January 1997 he moved abroad for the first time, going on to spend two 1/2-seasons with Sporting Clube de Portugal, for whom he rarely played.
In 1999, following a spell in Argentina with Club Atlético Vélez Sársfield, Ramírez signed with Cerro Porteño back in his homeland, scoring seven goals in 22 games in the 2001 national championship to help his team lift the trophy.
He was selected by manager Paulo César Carpegiani for his 1998 FIFA World Cup squad, and appeared in two group stage contests in France, against Bulgaria and Spain (both 0–0 draws).