Shihab al-Din Abu'l-Abbas Ahmad ibn Muhammad ibn Abu Bakr al-Qastallani al-Qutaybi al-Shafi'i, also known as Al-Qastallani was a SunniIslamic scholar who specialized in hadith and theology. He owed his literary fame mainly to his exhaustive commentary on the Sahih al-Bukhari entitled Irshad al-Sari fi Sharh al-Bukhari.
He was a contemporary of Suyuti, and between the two there were several scholarly challenges, Arabic: 'Khusumat'. The subject of the arguments were focused on al-Qastallani's Shaykh al-Sakhawi, but eventually al-Qastallani went to Suyuti to apologize.
Qastallani settled on the Shafi'i school later in life, though he was initially a follower of the Maliki school in jurisprudence. In regard to Islamic theology, Qastallani was a proponent of the Ash'ari school for which he is considered one of the main figureheads.