Masih is the Arabic word for Messiah. In modern Arabic it is used as one of the many titles of Isa (عيسى `Īsā). Masih is most often used by Arab Christians as well as Muslims, and is written as Yasu' al-Masih (يسوع المسيح Yasū`a al-Masīħ) or Isa al-Masih.

The word Masih literally means "anointed one," and in Islam, Isa al-Masih is believed to have been anointed from birth by Alläh with the specific task of being a prophet and a king. The Israelites, to whom Isa was sent, had a traditional practice of anointing their kings with oil. In Islam, he has also been given the task of killing the false messiah al-Dajjal (similar to the Antichrist in Christianity), who will emerge shortly before him during Qiyamah. After he has destroyed al-Dajjal, his final task will be to become leader of the Muslims. During this time, Muslims believe that Isa will dispel the false Christian claims about him.