ʿIlm al-Kalām (Arabic: علم الكلام, literally "science of discourse"), usually foreshortened to kalam and sometimes called "Islamic scholastic theology", is an Islamic undertaking born out of the need to establish and defend the tenets of Islamic faith against doubters and detractors. A scholar of kalam is referred to as a mutakallim (plural mutakallimūn) as distinguished from philosophers, jurists, and scientists. There are many possible interpretations as to why this discipline was originally called "kalam"; one is that the widest controversy in this discipline has been about whether the Word of God, as revealed in the Qur'an, can be considered part of God's essence and therefore not created, or whether it was made into words in the normal sense of speech, and is therefore created.
The Arabic term kalam means "speech" and its use for the name of the Islamic theology has the root in the Quran which is the "Word of God" (kalām Allāh).
The discipline of Kalam arose in an "attempt to grapple" with several "complex problems" early in the history of Islam, according to historian Majid Fakhry. One was how to rebut arguments "leveled at Islam by pagans, Christians and Jews". Another was how to deal with (what some saw as the conflict between) the predestination of sinners to hell on the one hand and "divine justice" on the other, (some asserting that to be punished for what is beyond someone's control is unjust). Also Kalam sought to make "a systematic attempt to bring the conflict in data of revelation (in the Qur'an and the Traditions) into some internal harmony".
Kalam or Ilm al-Kalam (lit. "science of discourse") is a term for philosophical theology in Islam.
Kalam can also refer to: