Kōloa is an unincorporated community and census-designated place (CDP) in Kauaʻi County, Hawaiʻi, United States.

"[3][4] The "native duck" is the correct translation for the similar-looking koloa (without the macron).

[5] According to one account, the district of Kōloa was named for a steep rock called Pali-o-kō-loa which was found in Waikomo Stream.

According to the United States Census Bureau, the CDP has a total area of 1.2 square miles (3.2 km2), all of it recorded as land.

The Old Sugar Mill of Koloa was the first major sugarcane plantation in Hawaii in 1835.

[9][10] Missionary Daniel Dole and his family opened a boarding school for English-speaking children, sometimes called the Koloa Academy, in 1855.