John Owen ʻAimoku Dominis (January 9, 1883 – July 7, 1917) was the illegitimate son of John Owen Dominis and Mary Purdy and hānai son of Queen Liliʻuokalani of Hawai'i. He served as a Trustee of Queen Liliʻuokalani's Trust, in which he was named a beneficiary.
He was born on January 9, 1883, in the Waikiki residence of Liliʻuokalani. The boy was the illegitimate son of Liliʻuokalani's husband John Owen Dominis and Mary Purdy Lamiki ʻAimoku (1855–1921), one of her household retainers. His father was an American settler from Schenectady, New York who served in many political posts including as Governor of Oʻahu during the reigns of the Kamehamehas and the House of Kalākaua, which he married into. His mother was a hapa-haole, of part Hawaiian descent, while his maternal grandmother Mary Purdy was a relative of the family of Samuel Parker.
Liliʻuokalani had learned of the pregnancy from the royal physician Georges Phillipe Trousseau in November 1882. In an effort to protect her unfaithful husband, she considered claiming the child as their own and establishing him as the next in line to the throne. This act would have been illegal. Instead, he was cared for by his grandmother Mary Purdy and financially supported by Liliʻuokalani, who adopted him under the Hawaiian tradition of hānai. Besides ʻAimoku, she also adopted Lydia Kaʻonohiponiponiokalani Aholo and Joseph Kaiponohea ʻAeʻa. Liliʻuokalani would later succeed as Queen of Hawaii in 1891 and be overthrown in 1893. After a period as the Republic of Hawaii, the islands were annexed to the United States becoming the Territory of Hawaii. Revolutionists and annexationists openly criticized 'Aimoku's mother and the circumstances of his illegitimate birth in order to undermine the reputation of the former queen. During this politically turbulent period, 'Aimoku attended the ʻIolani School.