Lands of the Crown of Saint Stephen

Flag of the Kingdom of Hungary from 1867 to 1918. It was known officially as the Lands of the Crown of Saint Stephen, or Transleithania, to differentiate from the Austrian Crownlands, or Cisleithania.

Original Flag:
https://upload.wikimedia.org/wikipedia/commons/thumb/2/2f/Flag_of_Hungary_%281867-1918%29.svg/640px-Flag_of_Hungary_%281867-1918%29.svg.png

Hungarian People's Republic (1957-1989) and Republic of Hungary

Flag of the Republic of Hungary (officially Hungary since 2012), and of the Hungarian People's Republic, adopted in 1957.

Original Flag:
https://upload.wikimedia.org/wikipedia/commons/thumb/c/c1/Flag_of_Hungary.svg/640px-Flag_of_Hungary.svg.png

Hungarian People's Republic (1949-1956)

Flag of the Hungarian People's Republic from 1949 to 1956.

Original Flag:
https://upload.wikimedia.org/wikipedia/commons/thumb/e/ec/Flag_of_Hungary_%281949-1956%29.svg/640px-Flag_of_Hungary_%281949-1956%29.svg.png