The Rules of the Game (Italian: Il gi(u)oco delle parti [il ˈdʒ(w)ɔːko ˈdelle ˈparti]) is a play by Luigi Pirandello. It was written and first performed during 1918 (and first published in 1919) at the time when his wife was suffering from mental illness, but before she was committed to a mental hospital. It was first performed at the Teatro Quirino in Rome, with Ruggero Ruggeri as Leone. The Italian title means The Game of Roles, but the play is not usually published with that title in English.
The characters in Pirandello's better-known work Six Characters in Search of an Author (1921) are rehearsing this play.