Mahmud Celaleddin Efendi

Mahmud Celaleddin Efendi (c. 1750–1829) was an Ottoman calligrapher. Born in Dagestan in the Caucasus, he moved to Istanbul as a boy. After a disagreement over style he left his teacher and taught himself by studying the master Hâfiz Osman, developing his own versions of the sülüs and naskh scripts.

He left monumental inscriptions at the Eyüp Sultan imaret and the tomb of Mihrişah Sultan, and Sultan Abdülmecid was his pupil. At first doubting that the young Esmâ Ibret Hanim had written the samples shown to him, he accepted her after investigating and later married her. He died in 1829.