A chādor (Persian, Urdu: چادر, lit. 'tent'), also variously spelled in English as chadah, chad(d)ar, chader, chud(d)ah, chadur, and naturalized as /tʃʌdər/, is an outer garment or open cloak worn by many women in the Persian-influenced countries of Iran, Afghanistan, Pakistan and to a lesser extent Tajikistan, as well as in Shia communities in Iraq, Bahrain, and Qatif in Saudi Arabia in areas in public spaces or outdoors. A chador is a full-body-length semicircle of fabric that is open down the front. The garment is pulled over the head, and is held closed at the front by the wearer; the chador has no hand openings, buttons, or clasps. It may also be held closed by being tucked under the wearer's arms. The word in Classical Persian could be used in reference to almost any cloth, headscarf, or even tents. This definition is mostly retained in eastern dialects of Persian which commonly use chādar in reference to almost any cloth or scarf, including loosely worn scarves that would be inappropriate to call a chador in Iranian Persian.

Before the 1978–1979 Iranian Revolution, black chadors were reserved for funerals and periods of mourning; colourful, patterned fabrics were the norm for everyday wear. Currently, the majority of Iranian women who wear the chador use the black version outside, and reserve light-coloured chadors for indoor use.