Agathi "Agi" Kassoumi (Greek: Αγαθη "Αγη" Κασούμη, born 13 July 1966) is a Greek pistol shooter who has competed at six Olympic Games between 1984 and 2004. Her best position was 11th in the 25 metre pistol at the 1992 Olympics. She is the second Greek, after sailor Anastasios Bountouris, to compete at six Olympic Games.