Shihāb al-Dīn Abu'l-‘Abbās Aḥmad ibn Muḥammad ibn Abī Bakr al-Qasṭallānī al-Qutaybī al-Shāfi‘ī (Arabic: أحمد بن محمد ابن أبي بكر ابن عبد الملك بن أحمد بن حسين بن علي القسطلاني المصري الشافعي), also known as Al-Qasṭallānī was a Sunni Islamic scholar who specialized in hadith and theology.
[1] He owed his literary fame mainly to his exhaustive commentary on the Sahih al-Bukhari entitled Irshād al-Sarī fī Sharḥ al-Bukhārī.
[2] He was a contemporary of Suyuti, and between the two there were several scholarly challenges, Arabic: 'Khusumat'.
[6] Qasṭallānī settled on the Shāfi‘ī school later in life, though he was initially a follower of the Maliki school in jurisprudence.
In regard to Islamic theology, Qasṭallānī was a proponent of the Ash'ari school for which he is considered one of the main figureheads.