Rell Kapolioka'ehukai Sunn (born July 31, 1950, Makaha, Oahu, Hawaii – d. January 2, 1998, Makaha, Oahu, Hawaii) was an American world surfing champion. Known as "Queen of Makaha" and "Aunty Rell", she was a pioneer in the world of women's surfing.
In 1982, during a pro surf meet in Huntington Beach, California, Sunn felt a lump in her breast which turned out to be breast cancer. When she was diagnosed in 1983, her prognosis was for one year. Sunn continued to surf every day after her diagnosis, despite the pain and chemotherapy associated with the disease.
Following her diagnosis, Sunn became a radio disc jockey and surf reporter, a physical therapist at a Waianae care home, and a counselor at a cancer research center. She helped pilot a program for breast cancer awareness at the Wai'anae Cancer Research Center that involved educating local women about the causes and prevention of breast cancer.
Sunn died on January 2, 1998, aged 47. More than 3,000 people attended her memorial service, where her ashes were scattered in the ocean off her native Makaha. 
Rell Sunn had one daughter, Jan, who is married to Tony Carreira; Sunn's two grandchildren are Kamalanikauikapolila'i and Kaumanakamokilaokaehuka'i.
Tributes and memorials
- In 1996, Sunn was the topic of the song "Mother Of The Sea" by Hawaiian Singer/Songwriter Darren Benitez.
- In August 1996, Sunn was honored with a granite stone on the Huntington Beach Surfing Walk of Fame.
- In 1997, an award-winning documentary about Sunn's life, Heart of the Sea, was filmed by Charlotte Lagarde and Lisa Denker.
- In 2010 a book, Stories of Rell Sunn: Queen of Mākaha, was published.
-  Honolulu Star-Bulletin, editorial, January 5, 1998.
- Rell Sunn - the Queen of Makaha, the Heart of the Sea
- Honolulu Star-Bulletin Sports
- ."Heart of the Sea" site
- Cooper, Jeanne (2011-02-04). "Rell Sunn: Celebrating Hawaii's queen of surfing". SFGate web site. Hearst Communications Inc. Retrieved 2011-02-04.
- Rell Sunn's Official Website
- Rell Sunn's Photographs
- Rell Sunn's Short Bio
- Rell Sunn's Pictures
- Rell Sunn's Funeral Service
- Sunn's article
- Rell Sunn's obituary
- "Heart of the Sea"