ʿIzz ad-Dīn ibn Abd al-Qāder ibn Mustafā ibn Yūsuf ibn Muhammad al-Qassām (Arabic: عز الدين بن عبد القادر بن مصطفى بن يوسف بن محمد القسام; 1881 or 19 December 1882 – 20 November 1935) was a Syrian Muslim preacher and a leader in the local struggles against British and French Mandatory rule in the Levant and an opponent of Zionism in the 1920s and 1930s.
Qassam was born in Jableh, Syrian province of the Ottoman Empire in 1882. He studied at Al-Azhar University in Egypt and afterward became an Islamic revivalist preacher in his hometown. Following his return, he became an active supporter of the Libyan resistance to the Italian occupation starting 1911, raising funds and fighters to aid the Libyans and penning an anthem for them. He would later lead his own group of rebels in alliance with Ibrahim Hananu to fight against the French Mandate in northern Syria ratified on 29 September 1923.