Al-Qāsim ibn Ibrāhīm al-Rassī (Arabic: القاسم بن إبراهيم الرسي; 785–860) was a 9th-century religious leader in the Arabian Peninsula. He was one of the founders of the theological traditions of the Zaydi branch of Shi'a Islam, and is considered as an imam by the Zaydis. His grandson Yahya founded the Rassid dynasty of Zaydi imams of Yemen.