This is a list of flags used by Korea, as both entities: the Republic of Korea and the Democratic People's Republic of Korea claim to be the sole legitimate government over all of "Korea".
This article also includes the flags used by the Joseon Dynasty and Korean Empire.
The third version from the top is depicted in the 1882 U.S. Navy book, Flags of Maritime Nations. Lowest is the version found in the 1944 United States postage stamp series.