Kapoor or Kapur and sometimes but rarely Capoor (Punjabi: ਕਪੂਰ‌, Hindi: कपूर‌) is the name of a clan of Sikhs and Hindus belonging to the Khatri (Kshatriya or warrior) caste. They are part of the "Dhai Ghar", meaning two and a half houses. Kapurs, Malhotra (also called Mehras or Mehrotras), Khanna and Seth (also called Kakkar) marry their children with each other. Kapoor can not marry a Kapoor but can only marry Malhotra, Khanna or Seth. This leaves three "Ghars" to marry out of which they are not supposed to marry any of their mother's side relatives with mother's paternal last name (it could be Khanna, Malhotra or Seth). Which makes it "Dhai Ghar Marriage that is why the word "Dhai Ghar". The clan hails originally from the Punjab region of the subcontinent of India. They are now spread across the world and the surname "Kapoor" or "Kapur" is a privileged one in India. It is believed anciently it was a privilege for a girl to get married in the Kapoor domain like Malhotra, Mehra, etc. Prominent families bearing this name include:

• The Maharajas of Burdwan in Bengal, detailed below.
• The Kapoor family of Bollywood, five generations of theatre and cinema personalities;
• Rai Bahadur Jankidas Kapur, who founded Atlas Cycles Ltd. in 1950 at Sonepat in present-day Haryana;
• Dr. Brij Mohan Kapoor, Professor Emeritus of Botany at St. Mary's University in Halifax, Nova Scotia; Kapoor published over 200 papers and discovered a number of plant species.

In addition, many notable contributors to modern Indian society belong to the Kapoor clan (see below).

Kapoor Khatris claim Caucasian Avar and Chuvash ancestry.