Sidi Omar () is an ancient Senussi tomb located in the Egyptian desert in the Matrouh Governorate. It serves as the demarcation of the border between Libya and Egypt since the Italo-Egyptian Treaty of Jaghbub (1925).
During the colonial period of Italian Libya, a series of defensive positions were built on the Italian side of the Frontier Wire (Libya) to support Fort Capuzzo, also called Sidi Omar (by the British Libyan Sidi Omar) and Sidi Omar Nuovo.Christie, Howard R. Fallen eagles: the Italian 10th Army in the opening campaign in the western desert, June 1940 - December 1940 (Thesis). Fort Leavenworth, KS: Command and General Staff College (CGSC) MMAS thesis, 04-06-1999.
During the Second World War, the area of Sidi Omar played a significant role in Operation Compass, Operation Battleaxe and Operation Crusader
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