A hijab or ḥijāb (/hɪˈdʒɑːb/, /hɪˈdʒæb/, /ˈhɪ.dʒæb/ or /hɛˈdʒɑːb/;Arabic: حجاب‎, pronounced [ħiˈdʒæːb] or [ħiˈɡæːb]) is a veil that covers the head and chest, which is particularly worn by some Muslim women beyond the age of puberty in the presence of adult males outside of their immediate family. It can further refer to any head, face, or body covering worn by Muslim women that conforms to a certain standard of modesty. Hijab can also be used to refer to the seclusion of women from men in the public sphere, or it may embody a metaphysical dimension – Al-hijab refers to "the veil which separates man or the world from God".

Most often, it is worn by Muslim women as a symbol of modesty, privacy and morality. According to the Encyclopedia of Islam and Muslim World, modesty in the Quran concerns both men's and women's "gaze, gait, garments, and genitalia." The Quran admonishes Muslim women to dress modestly and cover their breasts and genitals. Most Islamic legal systems define this type of modest dressing as covering everything except the face and hands in public. These guidelines (for covering of the entire body except for the hands, the feet and the face) are found in texts of fiqh and hadith developed after the revelation of the Quran but, according to some, are derived from the verses (ayahs) referencing hijab in the Quran. Many believe that the Quran itself does not mandate that women wear hijab.