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The 1918–19 season was Galatasaray SK's 15th in existence. The Istanbul Football League was unaccomplished due to the Armistice of Mudros.

Istanbul Football League

13 December 1918 1	Galatasaray SK	1–3	Üsküdar Anadolu SK	İttihat Spor Field, Istanbul
		(Report)		Referee: Unknown

24 January 1919 2	Galatasaray SK	1–7	Süleymaniye SK	İttihat Spor Field, Istanbul
		[1]		Referee: Unknown

7 February 1919 3	Galatasaray SK	7–0	Anadolu Hisarı İdman Yurdu SK	İttihat Spor Field, Istanbul
		(Report)		Referee: Unknown

7 March 1919 4	Galatasaray SK	1–4	Altınordu İdman Yurdu SK	İttihat Spor Field, Istanbul
		(Report) After that match, the league was cancelled. Galatasaray SK played only friendly matches.		Referee: Unknown

Kick-off listed in local time (EEST)

20 September 1918	Fenerbahçe SK	4–0	Galatasaray SK	İttihat Spor Field, Istanbul
16:30 EET	Zeki Rıza Sporel 20', 75', 85' Alaattin Baydar 30'	(Report)^[1]		Referee: Aydınoğlu Raşit Bey

Futbol vol.2, Galatasaray. Tercüman Spor Ansiklopedisi.(1981) (page 556-557)
Atabeyoğlu, Cem. 1453-1991 Türk Spor Tarihi Ansiklopedisi. page(73).(1991) An Grafik Basın Sanayi ve Ticaret AŞ
1918-1919 İstanbul Futbol Ligi. Türk Futbol Tarihi vol.1. page(42). (June 1992) Türkiye Futbol Federasyonu Yayınları.