Abstract Oppression affects the mental health of the oppressed people. There is a wellestablished link between the wellbeing of a person and the environment he lives in. An oppressive environment will have an adverse effect on the mental wellbeing and cause several disorders. Harold Pinter has made his mission to fight against oppression especially the political oppression thrust on common people by the governmental institutions. His plays testify his crusade against oppression. Also, his protagonists reveal severe mental disorders caused by the oppressive environment they face. This article seeks to study the effects of political institutionalized oppression on the mental health of the characters in the plays of Harold Pinter.