The rank of Sirdar – a variant of Sardar – was assigned to the British Commander-in-Chief of the British-controlled Egyptian Army in the late 19th and early 20th centuries. The Sirdar resided at the Sirdaria, a three-block-long property in Zamalek which was also the home of British military intelligence in Egypt.

Sardar, also spelled as Sardaar/Sirdar, is a title of royalty and nobility that was originally used to denote princes, noblemen, chiefs, kings and other aristocrats. It has also been used to denote a chief or leader of a tribe or group. It is used as a Persian synonym of the title Emir of Arabic origin.