Sayyid Muhammad Rashīd Rida Al-Hussaini (Arabic: سيد محمد رشيد رضا الحسيني, romanized: Muḥammad Rashīd Riḍā; 1865 – 22 August 1935) was an Islamic scholar, reformer, theologian and revivalist. An early Salafist, Rida called for the revival of hadith studies and, as a theoretician of an Islamic state, condemned the rising currents of secularism and nationalism across the Islamic world following the abolition of the Ottoman sultanate. He championed a global pan-Islamist program aimed at re-establishing a Caliphate to unite diverse peoples under a single global Islamic authority.
As a young hadith student who studied al-Ghazali and Ibn Taymiyya, Rida believed reform was necessary to save the Muslim communities, eliminate Sufist practices he considered heretical, and initiate an Islamic renewal. He left Syria to work with Abduh in Cairo, where he was influenced by Abduh's Islamic Modernist movement and began publishing al-Manar in 1898. Through al-Manar's popularity across the Islamic world, Rida became one of the most influential Sunni jurists of his generation, leading the Arab Salafi movement and championing its cause.