In Jewish law, ṭumah (Hebrew: טומאה, pronounced [tˤumʔa]) and ṭaharah (Hebrew: טהרה, pronounced [tˤaharɔ]) are the state of being ritually "impure" and "pure", respectively. The Hebrew noun ṭum'ah, meaning "impurity", describes a state of ritual impurity. A person or object which contracts ṭumah is said to be ṭamé (טמא‎ Hebrew adjective, "ritually impure"), and thereby unsuited for certain holy activities and uses (kedushah, קְדֻשָּׁה‎‎ in Hebrew) until undergoing predefined purification actions that usually include the elapse of a specified time-period.

The contrasting Hebrew noun ṭaharah (טָהֳרָה‎) describes a state of ritual purity that qualifies the ṭahor (טָהוֹר‎; ritually pure person or object) to be used for kedushah. The most common method of achieving ṭaharah is by the person or object being immersed in a mikveh (ritual bath). This concept is connected with ritual washing in Judaism, and both ritually impure and ritually pure states have parallels in ritual purification in other world religions.

The laws of ṭumah and ṭaharah were generally followed by the Israelites, particularly during the First and Second Temple Period, and to a limited extent are a part of applicable halakha in modern times.