Prince Kūhiō Day is an official holiday

Holiday

A Holiday is a day designated as having special significance for which individuals, a government, or a religious group have deemed that observance is warranted. It is generally an official or unofficial observance of religious, national, or cultural significance, often accompanied by celebrations...

 in the state of Hawaii

Hawaii

Hawaii is the newest of the 50 U.S. states , and is the only U.S. state made up entirely of islands. It is the northernmost island group in Polynesia, occupying most of an archipelago in the central Pacific Ocean, southwest of the continental United States, southeast of Japan, and northeast of...

 in the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

. It is celebrated annually on March 26, to mark the birth of Prince Jonah Kūhiō Kalanianaole

Jonah Kuhio Kalaniana'ole

Prince Jonah Kūhiō Kalanianaole Piikoi was a prince of the reigning House of Kalākaua when the Kingdom of Hawaii was overthrown by international businessmen in 1893...

 — heir to the throne of the Kingdom of Hawaii

Kingdom of Hawaii

The Kingdom of Hawaii was established during the years 1795 to 1810 with the subjugation of the smaller independent chiefdoms of Oahu, Maui, Molokai, Lānai, Kauai and Niihau by the chiefdom of Hawaii into one unified government...

, prince

Prince

Prince is a general term for a ruler, monarch or member of a monarch's or former monarch's family, and is a hereditary title in the nobility of some European states. The feminine equivalent is a princess...

 of the House of Kalākaua

House of Kalakaua

The House of Kalākaua, or the Kalākaua Dynasty, was the reigning family of the Kingdom of Hawaii between the assumption of King David Kalākaua to the throne in 1874 and the overthrow of Queen Liliuokalani in 1893. Liliuokalani died in 1917, leaving only cousins as heirs...

, and later territorial delegate

Territory of Hawaii

The Territory of Hawaii or Hawaii Territory was an organized incorporated territory of the United States that existed from July 7, 1898, until August 21, 1959, when its territory, with the exception of Johnston Atoll, was admitted to the Union as the fiftieth U.S. state, the State of Hawaii.The U.S...

 to the United States Congress

United States Congress

The United States Congress is the bicameral legislature of the federal government of the United States, consisting of the Senate and the House of Representatives. The Congress meets in the United States Capitol in Washington, D.C....

.
As Delegate, Kuhio authored the first Hawaii Statehood bill in 1919. He also won passage of the Hawaiian Homes Act, creating the Hawaiian Homes Commission and setting aside 200000 acres (809.4 km²) of land for Hawaiian homesteaders.

It is one of only two holidays in the United States dedicated to royalty, the other being Hawaii's King Kamehameha Day June 11.