Sūra al-Zumar (Arabic: سورة الزمر) is the thirty ninth sura of the Qur'an. It is one of the Makki suras placed in the twenty third and twenty fourth juz' of the Qur'an. The title Zumar ("groups") is taken from verses seventy one and seventy three in the sura, where the word appears to refer to the two groups of the people of Paradise and the people of Hell.

Sura al-Zumar includes themes such as resurrection, the fruits of the belief in the Oneness of God, glorifying Him, and the fact that human beings remember God and implore Him when they are afflicted, but when He saves them from the affliction, they forget Him.

Among the famous verses of the sura is verse fifty three, which instructs people never to lose their hope in God's mercy. The sura occupies nearly one sixtieth of the Quran.

As to the merits of reciting Sura al-Zumar, it is reported that on the Day of Judgment God will not make those who recite it hopeless and will grant them the reward of those who fear Him.