Siddig El Tahir El Fadil El Siddig Abderrahman Mohammed Ahmed Abdel Karim El Mahdi (born November 21, 1965) is a Sudanese-born English actor, also known as Siddig El Fadil and his stage name Alexander Siddig.

He is known for playing Dr. Julian Bashir in the television series Star Trek: Deep Space Nine, and for his performances as Prince Nasir Al-Subaai in Syriana (2005) and as Imad ad-Din al-Isfahani in Kingdom of Heaven (2005). He has also guest starred on 24 as Hamri Al-Assad. Siddig co-starred in the award-winning film Cairo Time (2009) as Tareq Khalifa.