M20 (Istanbul Metro)

The M20, officially referred to as the M20 Sefaköy–TÜYAP Metro Line is a planned rapid transit line in Istanbul.
The line was originally conceived as an extension to the M2 line but was later made into its own lines due to conflict and lack of communication between the opposition-controlled Istanbul Metropolitan Municipality and the government-controlled Ministry of Transport and Infrastructure and was later given the line code M20 on the vision map.

History

The line will be crucial for the districts it passes through with a total population of 3.5 million people, who currently have no alternative other than the Metrobus. Works on the line have not started yet, the plans and projects prepared by Istanbul Metropolitan Municipality were not approved by the General Directorate of the Infrastructural Investment for a period spanning more than a year. As a result of long discussions, the environmental impact assessment report process started on August 5, 2022. In the statement made by the Mayor of Istanbul, Ekrem İmamoğlu, he announced that the AYGM approval was received and that they are currently working on approval from the treasury.
In January 2025, the Turkish Presidency didn't give approval to start the construction for the sixth time even though all paperwork for the project was complete. The common view among the public on why the Presidency denies a signature from the project is the political polarization in Turkey. In recent years, Istanbul at large and the districts that the metro line surpasses tended to vote for the main opposition party, instead of the president's political party. Also, President Erdoğan views Mayor İmamoğlu as an opponent in the next presidential election and by delaying the construction he seeks to prevent a political victory for İmamoğlu.

No	Station	District	Transfer	Type	Notes
1	Sefaköy	Küçükçekmece	・ İETT Bus: 36AS, 73B, 73F, 73H, 76, 76C, 76O, 76V, 79Y, 89, 89A, 89B, 89BS, 89F, 89K, 89S, 98, 98AB, 98KM, 98S, 98TB, 146, AVR1A, HS3, HT20, KÇ2, MR42	Underground
2	Cennet	Küçükçekmece	İETT Bus: 76, 76C, 76O, 89F, 146	Underground
3	Küçükçekmece	Küçükçekmece	・ İETT Bus: 76, 76C, 76D, 76O, 89F, 145, 146, MK16, BN1	Underground
4	Reşitpaşa	Avcılar	İETT Bus: 76, 76C, 76O, 145, 146	Underground
5	Avcılar Merkez	Avcılar	İETT Bus: 76, 76B, 76BA, 76C, 76D, 76G, 76O, 142, 142A, 142ES, 142F, 142K, 144A, 145, 146, 303A, 401, 429A, 458, BM4, HS2, HT29, HT48	Underground	Istanbul University-Cerrahpaşa
6	Cihangir	Avcılar	İETT Bus: 76, 76BA, 76C, 76G, 76TM, 76Y, 145, 146, 147, 303A, 401, 429A, 458, BM4, HT29, HT48	Underground
7	Saadetdere	Avcılar	İETT Bus: 76, 76BA, 76C, 76G, 145, 303A, 401, 429A, 458, BM4, HT29, HT48	Underground
8	Beylikdüzü	Beylikdüzü	・ İETT Bus: 76, 76BA, 76C, 76G, 76TM, 144, 144H, 145, 303A, 400A, 401, 401T, 418, 429A, 448, 458, BM5, ES1, HT29, HT48	Underground	Beylikdüzü Square・Marmara Park
9	Yıldırım Beyazıt	Beylikdüzü	İETT Bus: 76BA, 76C, 76G, 76TM, 142B, 142T, 144, 144H, 303A, 400A, 401, 401T, 418, 429A, 448, BM6, BM7, ES1, ES3, HT48	Underground
10	TÜYAP	Büyükçekmece	İETT Bus: 76TM, 142B, 142T, 300, 300B, 300C, 300D, 300G, 300M, 300S, 303A, 401, 401T, 448, HT19, HT48	Underground