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- Kaʻahumanu, Hawaiian queen
- Duke Paoa Kahanamoku, Olympic swimmer and ambassador of surfing, born and died in Honolulu; interred at Oahu Cemetery in Honolulu.
- Carole Kai, singer and philanthropist.
- Natasha Kai, former US WNT soccer player, for Philadelphia Independence, born in Kahuku, Hawaii
- Henry J. Kaiser, industrialist
- Victoria Kaiulani, Hawaiian princess; interred at Royal Mausoleum in Honolulu.
- David Kalākaua, king, interred at Royal Mausoleum in Honolulu.
- Harry Kalas, sportcaster
- Jonah Kuhio Kalanianaole, Prince of Hawaii
- Emma Kaleleonalani Hawaiian monarch
- Israel Kamakawiwo‘ole, entertainer and singer
- Stacy Kamano, actress
- Kamehameha I, monarch that united the Hawaiian islands; interred at Royal Mausoleum in Honolulu.
- Kamehameha V, last of the House of Kamehameha
- Herb Kawainui Kāne, artist, historian, and cofounder of the Polynesian Voyaging Society.
- Gilbert Lani Kauhi, actor
- Kaumualii, last king of Kauai
- Guy Kawasaki, official Apple Computer evangelist
- Princess Ruth Keelikolani, Princess of the Kingdom of Hawaii, largest landowner in Hawaii, whose lands would later become the Bishop Estate
- Klaus Keil, geologist, known for mineral keilite
- Rabbit Kekai professional surfer, mentor was Duke Kahanamoku, born in Honolulu. He teaches surfing in Waikiki Beach.
- Douglas Kennedy actor, died in Honolulu; interred at National Memorial Cemetery of the Pacific in Honolulu.
- Keala Kennelly, professional surfer and actress, John from Cincinnati, Blue Crush, Step into Liquid
- Douglas Kenney actor, died in Kauai.
- Ed Kenney, actor and singer
- Steven L. Kent, Novelist/video game historian, was raised in Honolulu and attended Kalani High School.
- Chiefess Kapiolani; Hawaiian aliʻi
- Queen Kapiolani; Hawaiian queen
- Isaac C. Kidd; World War II Medal of Honor recipient; died in Pearl Harbor; interred at USS Arizona Memorial.
- Nicole Kidman, actress, born in Honolulu, Hawaii.
- Harry Kim, first Korean-American elected mayor in US
- Samuel Wilder King, Governor of the Territory of Hawaii and United States Representative from the Territory of Hawaii.
- Robert Kiyosaki, author of financial books
- Terence Knapp, actor and director, lives in Honolulu.
- Adney Y. Komatsu, General Authority of The Church of Jesus Christ of Latter-day Saints
- Konishiki (born Salevaa Atisanoe), sumo wrestler
- Glen Kozlowski, former football player who played wide receiver for the Chicago Bears
- Olin Kreutz, center for the New Orleans Saints
- Shogo Kubo professional skater, lives with his family in Oahu.
- Clyde Kusatsu actor, born in Honolulu and graduated Iolani High School.
Read more about this topic: List Of People From Hawaii