The Republic of Hawaii (Hawaiian: Lepupalika o Hawaiʻi, pronounced [lepupəˈlikə o həˈvɐjʔi]) was a short-lived one-party state in Hawaiʻi between July 4, 1894, when the Provisional Government of Hawaii had ended, and August 12, 1898, when it became annexed by the United States as an unincorporated and unorganized territory. In 1893, the Committee of Public Safety overthrew Queen Liliʻuokalani, the monarch of the Kingdom of Hawaiʻi, after she rejected the 1887 Bayonet Constitution. The Committee of Public Safety intended for Hawaii to be annexed by the United States; however, President Grover Cleveland, a Democrat opposed to imperialism, refused. A new constitution was subsequently written while Hawaii was being prepared for annexation.

The leaders of the Republic, such as Sanford B. Dole and Lorrin A. Thurston, were Hawaii-born descendants of American settlers who spoke the Hawaiian language but had strong financial, political, and family ties to the United States. They intended the Republic to become a territory of the United States. Dole was a former member of the Royal Legislature from Koloa, Kauai, and Justice of the Kingdom's Supreme Court, and he appointed Thurston—who had served as Minister of the Interior under King Kalākaua—to lead a lobbying effort in Washington, D.C., to secure Hawaii's annexation by the United States. The issue of overseas imperialism was controversial in the United States due to its colonial origins. Hawaii was annexed under Republican President William McKinley on 12 August 1898, during the Spanish–American War. The Territory of Hawaii was formally established as part of the U.S. on June 14, 1900.

The Blount Report "first provided evidence that officially identified the United States' complicity in the lawless overthrow of the lawful, peaceful government of Hawaii." American officials immediately recognized the new government and troops from the U.S. Marine Corps (USMC) were sent by the U.S. Minister to aid in the overthrow. The Queen's supporters claimed that the Marines' presence frightened the Queen and thus enabled the revolution.^{[citation needed]} Blount concluded that the United States had carried out unauthorized partisan activities, including the landing of U.S. Marines under a false or exaggerated pretext, to support the anti-royalist conspirators; that these actions were instrumental to the success of the revolution; and that the revolution was carried out against the wishes of a majority of the population of Hawaii.

In 1887, members of the Reform Party of Hawaii forced the King to accept a new constitution limiting the monarch's constitutional power as defined by the Constitution of 1864. The Constitution of 1887, also called the Bayonet Constitution for the threats used to secure the King's approval, was enacted without legislative approval, leaving the monarch as a figurehead. In 1893, a coup d'état against the monarch was carried out by more than 1,000 armed local men who were led by wealthy sugar planters and businessmen. There was no bloodshed as the royal armed forces did not resist. A temporary Provisional Government of Hawaii was formed by the Committee of Safety. The leaders of the coup, who had strong economic ties with the United States, wanted Hawaii to join the United States, lest the Empire of Japan take control. Annexation was delayed by two petitions with over 20,000 signatures representing over half of the Native Hawaiian population. Because U.S. President Cleveland opposed annexation, the Queen herself took up residence in Washington to lobby for her restoration.

President Cleveland sent an investigator who wrote the Blount Report, which concluded that Minister Stevens had manipulated and orchestrated the revolt. Cleveland decided that the United States should restore the Queen; he asked for Dole's resignation; however, Dole ignored the request. The U.S. Senate held hearings regarding another report called the Morgan Report, which undermined the Blount Report's claims. Public opinion in the United States favored annexation. In May 1894 the U.S. Senate unanimously passed a resolution opposing restoration of the Queen, opposing intrusion into the affairs of the Dole government, and opposing American action that could lead immediately to annexation. President Cleveland thereupon dropped the issue, leaving the Republic of Hawaii to effectively fend for itself.

The Provisional Government convened a constitutional convention, limited to Hawaiians, and taxpayers of American or European origins, not including Asians.

The President of Hawaii was the head of state and head of government of the Republic of Hawaii. The constitution provided that the presidential term of office would be six years and specified that individuals could not be elected to consecutive terms in office. The President had the authority to veto legislation, which could be overridden by two-thirds majority in both houses of the legislature, and he was also commander-in-chief of the military. The President appointed, subject to the confirmation of the Senate, members of his Cabinet. Cabinet members were considered users of both houses of the Legislature, they could participate in proceedings, but could not vote as they were not elected members of the Legislature. If the presidency became vacant, the Minister of Foreign Affairs could serve as Acting President until the Legislature voted to elect a successor.

Article 23 of the constitution of 1894 specifically named Sanford B. Dole as the republic's first President. He would also be the nation's only President, as it was annexed by the United States in 1898. Upon annexation, Hawaii became a U.S. territory and Dole became its first Governor.