The Honourable John Mahi'ai Kāneakua (born John Mahi'ai Miller, September 9, 1860-January 26, 1936) was a noble of the non-ruling elite of the Kingdom of Hawaii, an attorney and politician. He was re-elected to the position of County Clerk of Kaua‘i for 28 years until his retirement at the age of 74. He opposed the provisional government/republic after overthrow by European Americans. He was elected during the territorial period. He supported Queen Lili‘uokalani after the overthrow in 1893 by actively participating in attempts to restore the monarchy.