Sūra al-Qamar (the Moon) (Arabic: سورة القَمَر) is the fifty forth sura of the Qur'an. It is a Makki sura located in juz' twenty seven. This sura is called "al-Qamar" because it mentions the miracle of Shaqq al-Qamar (moon-splitting) by the Prophet (s). Verses of this sura are mostly warnings and in order to give lessons, they speak about previous nations and their bad conditions on the Day of Judgement upon coming out of graves and their attendance for reckoning of their deeds. People whose names are mentioned in this sura are 'Ad, Thamud, Lut and people of Pharaoh.

One of the famous verses of this sura is the verse which says that the Qur'an is presented in order to easily give lessons. This verse is repeated in this sura four times. About the merits of reciting this sura, it is transmitted from the Prophet (s) that whoever recites Sura al-Qamar every other day, will enter the Day of Judgement while his face will be bright like the full moon.