中古波斯语（波斯语：پارسی میانه）是印欧语系伊朗语支的一种语言，主要伊朗西南部的萨珊王朝（公元224年-654年）使用，并由于其声望而在其他地区得以使用。中古波斯语被分为西伊朗语支，发源自古波斯语并演化为现代波斯语。

Middle Persian is the Middle Iranian language or ethnolect of southwestern Iran that during the Sasanian Empire (224–654) became a prestige dialect and so came to be spoken in other regions of the empire as well. Middle Persian is classified as a Western Iranian language. It descends from Old Persian and is the linguistic ancestor of Modern Persian.