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Mecidiyeköy is a neighbourhood in the municipality and district of Şişli, Istanbul Province, Turkey.   Its population is 20,006 (2022).  It is a heavily built-up residential and business neighbourhood, squeezed in between the Fulya, Kuştepe, Gültepe, Esentepe, and Gülbahar neighbourhoods.
Busy Halaskargazi Street runs through Şişli to Mecidiyeköy where it intersects with the D100 motorway. The Şişli-Mecidiyeköy Metro stop on the M2 line stops near this chaotic intersection, connecting the area with Taksim and Yenikapı. It also connects with the newer Mecidiyeköy station on the M7 Metro line to Mahmutbey.
One exit from the Şişli-Mecidiyeköy Metro leads straight to the huge Cevahir shopping mall, which was, when it opened, the largest such mall in Europe.
Mecidiyeöy barely features on the sightseeing radar although there are a couple of things to attract the curious, most obviously the Abide-i Hürriyet (Liberty Monument) isolated amid the traffic chaos where Halaskargazi Street meets the D100 flyover. The monument commemorates the so-called 31 March incident when counter-revolutionaries attempted to overturn the new Young Turk government and return Sultan Abdülhamid II to the throne. Their effort failed and shortly afterwards the sultan was removed from office. Work on the monument was completed in 1911 and it went on to become a site for memorials to some Young Turks leaders, Enver Paşa and Talat Paşa. There is also a monument to Mithad Paşa, a reformist grand vizier who died in exile in what is now Saudi Arabia. The assassinated grand vizier Mahmud Sevked Paşa was actually buried here.
Just to the south of the D100 flyway are three large cemeteries, one belonging to the Rum (Greek) Orthodox community, one to the Italian Jewish community and the third to the Armenian community. The Jewish cemetery is rarely open to outsiders. Buried in the Rum (Greek) Cemetery are the founders of the tiny and controversial Turkish Orthodox Church, Papas Eftim I, II and III.
Mecidiyeköy is an important passenger transport hub on the European part of Istanbul.