Prince Kiril of Bulgaria, Prince of Preslav (Bulgarian: Кирил, принц Преславски, German: Kyrill Heinrich Franz Ludwig Anton Karl Philipp Prinz von Bulgarien; 17 November 1895 – 1 February 1945) was the second son of Ferdinand I of Bulgaria and his first wife Marie Louise of Bourbon-Parma.

He was born on 17 January 1895 in Sofia as the second son of Ferdinand I of Bulgaria and his first wife, Marie Louise of Bourbon-Parma.

In September 1936, Prince Kiril accompanied King Edward VIII on a whistle-stop tour of Iceland.

Prince Kiril, with the widowed Tsaritsa, Giovanna of Savoy, daughter of the Italian king, led the state funeral for his brother Tsar Boris III on 5 September 1943 at the Alexander Nevsky Cathedral, Sofia, thereafter proceeding across the city to the main railway station where the funeral train waited to take the body to the 12th-century Rila Monastery in the mountains.

Thereafter, three consecutive governments made efforts to extricate themselves from Bulgaria's agreements with Germany, notably that which permitted their use of the railway to Greece and the German troops stationed along it for protection.