Kalākaua (David Laʻamea Kamanakapuʻu Māhinulani Nālaʻiaʻehuokalani Lumialani Kalākaua; November 16, 1836 – January 20, 1891), was the last king and penultimate monarch of the Kingdom of Hawaiʻi, reigning from February 12, 1874, until his death in 1891. Succeeding Lunalilo, he was elected to the vacant throne of Hawaiʻi against Queen Emma. Kalākaua was known as the Merrie Monarch for his convivial personality – he enjoyed entertaining guests with his singing and ukulele playing. At his coronation and his birthday jubilee, the hula, which had hitherto been banned in public in the kingdom, became a celebration of Hawaiian culture.

During Kalākaua's reign, the Reciprocity Treaty of 1875 brought great prosperity to the kingdom. Its renewal continued the prosperity but allowed United States to have exclusive use of Pearl Harbor. In 1881, Kalākaua took a trip around the world to encourage the immigration of contract sugar plantation workers. He wanted Hawaiians to broaden their education beyond their nation. He instituted a government-financed program to sponsor qualified students to be sent abroad to further their education. Two of his projects, the statue of Kamehameha I and the rebuilding of ʻIolani Palace, were expensive endeavors but are popular tourist attractions today.

Extravagant expenditures and Kalākaua's plans for a Polynesian confederation played into the hands of annexationists who were already working toward a United States takeover of Hawaiʻi. In 1887, Kalākaua was pressured to sign a new constitution that made the monarchy little more than a figurehead position. After his brother William Pitt Leleiohoku II died in 1877, the king named their sister Liliʻuokalani as heir-apparent. She acted as regent during his absences from the country. After Kalākaua's death, she became the last monarch of Hawaiʻi.

Kalākaua was born at 2:00 a.m. on November 16, 1836, to Caesar Kaluaiku Kapaʻakea and Analea Keohokālole in the grass hut compound belonging to his maternal grandfather ʻAikanaka, at the base of Punchbowl Crater in Honolulu on the island of Oʻahu. Of the aliʻi class of Hawaiian nobility, his family was considered collateral relations of the reigning House of Kamehameha, sharing common descent from the 18th-century aliʻi nui Keaweʻīkekahialiʻiokamoku. From his biological parents, he descended from Keaweaheulu and Kameʻeiamoku, two of the five royal counselors of Kamehameha I during his conquest of the Kingdom of Hawaiʻi. Kameʻeiamoku, the grandfather of both his mother and father, was one of the royal twins alongside Kamanawa depicted on the Hawaiian coat of arms. However, Kalākaua and his siblings traced their high rank from their mother's line of descent, referring to themselves as members of the "Keawe-a-Heulu line", although later historians would refer to the family as the House of Kalākaua. The second surviving child of a large family, his biological siblings included his elder brother James Kaliokalani, and younger siblings Lydia Kamakaʻeha (later renamed Liliʻuokalani), Anna Kaʻiulani, Kaʻiminaʻauao, Miriam Likelike and William Pitt Leleiohoku II.

Given the name Kalākaua, which translates into "The Day [of] Battle," the date of his birth coincided with the signing of the unequal treaty imposed by British Captain Lord Edward Russell of the Actaeon on Kamehameha III. He and his siblings were hānai (informally adopted) to other family members in the Native Hawaiian tradition. Prior to birth, his parents had promised to give their child in hānai to Kuini Liliha, a high-ranking chiefess and the widow of High Chief Boki. However, after he was born, High Chiefess Haʻaheo Kaniu took the baby to Honuakaha, the residence of the king. Kuhina Nui (regent) Elizabeth Kīnaʻu, who disliked Liliha, deliberated and decreed his parents to give him to Haʻaheo and her husband Keaweamahi Kinimaka. When Haʻaheo died in 1843 she bequeathed all her properties to him. After Haʻaheo's death, his guardianship was entrusted to his hānai father, who was a chief of lesser rank; he took Kalākaua to live in Lāhainā on the island of Maui. Kinimaka would later marry Pai, a subordinate Tahitian chiefess, who treated Kalākaua as her own until the birth of her own son.

At the age of four, Kalākaua returned to Oʻahu to begin his education at the Chiefs' Children's School (later renamed the Royal School). He and his classmates had been formally proclaimed by Kamehameha III as eligible for the throne of the Kingdom of Hawaiʻi. His classmates included his siblings James Kaliokalani and Lydia Kamakaʻeha and their thirteen royal cousins including the future kings Kamehameha IV, Kamehameha V and Lunalilo. They were taught by American missionaries Amos Starr Cooke and his wife, Juliette Montague Cooke. At the school, Kalākaua became fluent in English and the Hawaiian language and was noted for his fun and humor rather than his academic prowess. The strong-willed boy defended his less robust elder brother Kaliokalani from the older boys at the school.

In October 1840, their paternal grandfather Kamanawa II requested his grandsons to visit him on the night before his execution for the murder of his wife Kamokuiki. The next morning the Cookes allowed the guardian of the royal children John Papa ʻĪʻī to bring Kaliokalani and Kalākaua to see Kamanawa for the last time. It is not known if their sister was also taken to see him. Later sources, especially in biographies of Kalākaua indicated that the boys witnessed the public hanging of their grandfather at the gallows. Historian Helena G. Allen noted the indifference the Cookes' had toward the request and the traumatic experience it must have been for the boys.

After the Cookes retired and closed the school in 1850, Kalākaua briefly studied at Joseph Watt's English school for native children at Kawaiahaʻo and later joined the relocated day school (also called Royal School) run by Reverend Edward G. Beckwith. Illness prevented him from finishing his schooling and he was sent back to Lāhainā to live with his mother. Following his formal schooling, he studied law under Charles Coffin Harris in 1853. Kalākaua would appoint Harris as Chief Justice of the Supreme Court of Hawaiʻi in 1877.