The Kingdom of Croatia (Croatian: Kraljevina Hrvatska; ) was an administrative division that existed between 1527 and 1868 within the Habsburg Monarchy (also known between 1804 and 1867 as the Austrian Empire). The Kingdom was a part of the Lands of the Crown of St. Stephen, but was subject to direct Imperial Austrian rule for significant periods of time, including its final years. Its capital was Zagreb.
Until the 18th century, the Habsburg Kingdom of Croatia included only a small north-western part of present-day Croatia around Zagreb, and a small strip of coastland around Rijeka that was not part of the Ottoman Empire or part of the Habsburg Military Frontier. Between 1744 and 1868 the Kingdom of Croatia included a subordinate autonomous kingdom, the Kingdom of Slavonia. The territory of the Slavonian Kingdom was recovered from the Ottoman Empire, and was subsequently part of the Habsburg Military Frontier for a period. In 1744 these territories were organized as the Kingdom of Slavonia and included within the Kingdom of Croatia as an autonomous part. In 1849, the two kingdoms were completely separated and existed as two separate administrative units. In 1868 both were merged again into the newly formed Kingdom of Croatia-Slavonia.