The Metro M2 Yenikapı-Hacıosman (Turkish: M2 Yenikapı-Hacıosman Metro Hattı) is a rapid transit service of the Istanbul Metro. Starting at Hacıosman near Sarıyer, it runs underneath the north-south Büyükdere Avenue, crosses the Golden Horn and ends at Yenikapı in Fatih. There is a shuttle, which services a branch from Sanayi Mahallesi to Seyrantepe, where the Türk Telekom Arena is located. The M2 operates from 6:15 am to 12:00 am everyday.
The M2 starts at Hacıosman in southwestern Sarıyer. From there it travels under Büyükdere Avenue, a major north-south road in the city, through İstanbul's two major financial districts; Maslak and Levent. The line then heads slightly west just south of Levent through Şişli to historical Taksim Square. From there M2 heads through western Beyoğlu to Şişhane. It crosses the Golden Horn towards the Old City and terminates in Yenikapı, a transport hub.