1940 in Turkey

• 6th Parliament of Turkey

• President – İsmet İnönü
• Prime Minister – Refik Saydam

• Ruling party – Republican People’s Party (CHP)

12th government of Turkey

• 18 January – Law of national prevention (Milli Korunma Kanunu) a law which authorizes the government to control the economy to overcome the war time hardships
• 17 April – The law of Village Institutes
• 29 June – Turco German trade agreement
• 20 October – Census (Population17,820,950)
• 25 November – Martial law in the European part of Turkey
• 20 December – Earthquake in the East Anatolia

• 1 January – Alp Yalman, businessman
• 23 January – Dinç Bilgin, businessman, media owner
• 27 January – Ahmet Kurtcebe Alptemoçin, government minister
• 15 February – İsmail Cem İpekçi, government minister
• 23 February – Kamer Genç, politician
• 10 July – Rıfat Çalışkan, cyclist
• 29 July – Aytaç Yalman, general
• 1 September – Yaşar Büyükanıt, chief of staff
• 6 September – Mesut Yılmaz, prime minister (48th, 53rd and 55th government of Turkey)
• 18 October – Onur Öymen, politician, diplomat
• 20 November – Ediz Hun, actor

• 19 March – Besim Ömer Akalın (born in 1862), MD and politician
• 18 April – Lütfi Müfit Özdeş (born in 1874), military officer
• 13 October – Muhittin Akyüz (born in 1879), military officer, diplomat and politician

• 
  İsmet İnönü
• 
  Refik Saydam
• 
  Kamer Genç
• 
  Yaşar Büyükanıt
• 
  Onur Öymen
• 
  Besim Ömer Akalın
• 
  Lütfi Müfit Özdeş
• 
  Muhittin Akyüz