Hazrat Abass RA ibn ʻAli RA (Arabic: ٱلْعَبَّاس ٱبْن عَلِيّ‎, romanized: al-ʿAbbās ibn ʿAlī), also known as Qamar Banī Hāshim (Arabic: قَمَر بَنِي هَاشِم‎) "the moon of Banu Hashim"and Abolfazl (born 4 Shaʻbān 26 AH – 10 Muharram 61 AH; c. 15 May 647 – 10 October 680), was a son of Ali (who was the first Shi′i Imam and the fourth Caliph of Sunni Muslims) and Fatima bint Hizam, commonly known as Umm al-Banīn "Mother of the Sons" (Arabic: أُمّ ٱلْبَنِين‎).

Abbas, also known as Alamdar (standard-bearer), is highly revered in Islam for his loyalty to his brother Husain, his respect for the Household of Muhammad, and his role in the Battle of Karbala. Abbas is buried in the Shrine of Abbas in Karbala, Karbala Governorate, Iraq, where he was martyred during the Battle of Karbala on the day of Ashura. He was praised for his "handsome looks" and was also well known in the Arab community for his courage, bravery, strength and ferocity as a warrior. Ibn Manzur narrates in his al-Ayn that Al-Abbas was the "lion that other lions feared" as a testament to his accolades as a warrior. Sheikh at-Turaihi describes Abbas's appearance as resembling an unshakable mountain, with his heart firmly rooted, due to his qualities as a "unique horseman" and a "fearless hero".