Mujir ad-Din Abaq (Arabic: مجير الدين عبد الدولة أبو سعيد عبق بن جمال الدين محمد, romanized: Mujīr ad-Dīn ʿAbd al-Dawla Abu Saʿīd ʿAbaq ibn Jamāl ad-Dīn Muhammad) (died 1169) was the Burid emir of Damascus from 1140 to 1154.
He was the eldest son of Jamal ad-Din Muhammad and the last Burid ruler of the Emirate of Damascus.
When this regent died in July 1149, Mujir ad-Din took his place as the rightful heir of Damascus.
He was a weak ruler, however, and Damascus came under the influence of Nur ad-Din Zangi, emir of Aleppo and Mosul, who had imposed his dominance over the city in the aftermath of the Second Crusade.
In 1152, Mujir ad-Din again besieged Bosra, until the governor of the city agreed to his demands and he returned to Damascus.