Abdülmecid I (Ottoman Turkish: عبد المجيد اول ‘Abdü’l-Mecīd-i evvel; 23/25 April 1823 – 25 June 1861), also known as Abdulmejid and similar spellings, was the 31st Sultan of the Ottoman Empire and succeeded his father Mahmud II on 2 July 1839. His reign was notable for the rise of nationalist movements within the empire's territories. Abdülmecid wanted to encourage Ottomanism among the secessionist subject nations and stop the rise of nationalist movements within the empire, but failed to succeed despite trying to integrate non-Muslims and non-Turks more thoroughly into Ottoman society with new laws and reforms. He tried to forge alliances with the major powers of Western Europe, namely the United Kingdom and France, who fought alongside the Ottoman Empire in the Crimean War against Russia. In the following Congress of Paris on 30 March 1856, the Ottoman Empire was officially included among the European family of nations. Abdülmecid's biggest achievement was the announcement and application of the Tanzimat (Reorganization) reforms which were prepared by his father and effectively started the modernization of the Ottoman Empire in 1839. For this achievement, one of the Imperial anthems of the Ottoman Empire, the March of Abdülmecid, was named after him.

Abdülmecid was born at the Beşiktaş Sahil Palace or at the Topkapı Palace, both in Constantinople. His mother was his father's first wife in 1839, Valide Sultan Bezmiâlem, originally named Suzi (1807–1852), either a Circassian or Georgian slave.

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