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.

[1] She is the second Greek, after sailor Anastasios Bountouris, to compete at six Olympic Games.

[2] She was named the Greek Female Athlete of the Year for 1984.

This biographical article relating to sport shooting in Greece is a stub.