Sūra al-Rad (Arabic: سورة الرَّعد) is the thirteenth sura of the Qur'an. It is a Madani sura which is located in the thirteenth juz' of the Qur'an. Its name comes from the word, "ra'd" (thunderstorm), which appears in its thirteenth verse. The content of the sura includes monotheism, God's power, truth of the Qur'an, prophethood of the Prophet Muhammad (s), resurrection, and characterizations of the Heaven and the Hell.

Verse twenty eight is the famous verses of this sura which considers the rest of hearts in remembrance of God and verse forty three about which, some exegetes believe that the phrase "he who possesses the knowledge of the Book" refers to Imam Ali (a). It is narrated that anyone who recites Sura al-Ra'd, God rewards him ten times as much of the clouds in the past, present and future.
This Surah Rad is recited by Abdul Basit, Mohamed Siddiq El-Minshawi, Abu Bakr al-Shatri and Saad al-Ghamdi, in their beautiful voices.