The Al-‘Abbās Mosque or Masjid al-‘Abbās (Arabic: مسجد الامام العباس‎) is the mausoleum of ‘Abbās ibn ‘Alī, located across from the Imām Husayn Mosque in Karbalā, Iraq. ‘Abbās was the brother of Hasan and Husayn, and was the flag-bearer for Husayn in the Battle of Karbalā.