Kazimierz Leon Sapieha () (1609âÂÂ1656) was a nobleman of the Grand Duchy of Lithuania, a part of the PolishâÂÂLithuanian Commonwealth.
He had various roles and titles, including Royal Secretary and Grand Writer of Lithuania from 1631, Court Marshal of Lithuania from 1637, Deputy Chancellor of Lithuania from 1645.
He was an opponent of Janusz Radziwià Âà  and organized anti-Swedish resistance in Lithuania during The Deluge.
He was the son of Great Secretary Lew Sapieha.
He studied abroad in Munich and Ingolstadt, later becoming a Sejm deputy in 1631. He was also one of four executors of Wà Âadysà Âaw IV Waza's last will.