The Governor of Kauaʻi was the royal governor or viceroy of the island of Kauaʻi and island of Niʻihau during the Kingdom of Hawaii. The governor was usually a male Hawaiian chief or prince, but several women also held the office. The governor had authority over the islands of Kauaʻi and Niʻihau, and it was up to the governor to appoint lieutenant governors to assist them. The governor had replaced the old alii aimokus of the islands, but the sovereignty remained with the king. The first governor was the last king of Kaumualiʻi, and it was not until his death in 1824 that Queen Kaʻahumanu and King Kamehameha II took control from his sons. The island governors were under the jurisdiction of the Ministers of the Interiors.

Kaumualiʻi was the last independent aliʻi nui of Kauaʻi and Niʻihau before becoming a vassal of Kamehameha I within the unified Kingdom of Hawaiʻi in 1810. He was the 23rd high chief of Kauaʻi and reigned during 1794–1810.