Brigadier-General Ratu Epeli Nailatikau, CF, LVO, OBE, MSD, KStJ (Fijian pronunciation: [epeli nailatʃikau]; born 5 July 1941) (often referred to as Na Turaga Mai Naisogolaca) is a Fijian chief who was President of Fiji from 2009 to 2015. He has had a long career in the Military, diplomatic service, and government. From 2001 to 2006 he served as Speaker of the House of Representatives – the lower and more powerful chamber of the Fijian Parliament. He was also the chairman of the Parliamentary Appropriations Committee and of the House Committee. On 8 January 2007, he was appointed the interim Minister for Foreign Affairs and External Trade; he was moved to the post of interim Minister for Provincial Development and Multi-Ethnic Affairs in September 2008. In October 2008, he became Indigenous Affairs Minister "and effectively Great Council of Chiefs chairman". On 17 April 2009, he was appointed Vice-President by the military government.

On 30 July 2009, he became acting president after the retirement of President Josefa Iloilo. On 5 November 2009, he was sworn in as President of Fiji. George Konrote was elected to succeed him in October 2015.

On 11 February 2019, he became the newly appointed Speaker of the Fijian Parliament, winning 30 votes against 21 to Opposition nominee and Suva lawyer, Tanya Waqanika.

Born to a family of politically powerful chieftains, Nailatikau's career spanned 20 years in the military and 17 years in the diplomatic service. Following his education at Bau District School, Draiba Fijian School, Levuka Public School and Queen Victoria School, Nailatikau trained as a soldier in New Zealand. In 1966, he served on secondment in the 1st Battalion, Royal New Zealand Infantry Regiment and was posted to Sarawak, Malaysia, during Indonesia's "Konfrontasi" against Malaysia. He proved to be a popular and highly respected officer. When he returned to the Fiji Infantry Regiment, he rose steadily through the ranks. By 1987, he held the rank of Brigadier-General, and was the Commander of the Royal Fiji Military Forces. While visiting Australia, he was deposed from this position, however, when the third-ranked officer, Lieutenant-Colonel Sitiveni Rabuka staged the first of two coups and seized power.

Nailatikau retired from the Army and decided to pursue a new career in the diplomatic service. After completing the Foreign Service Course at Oxford University in the United Kingdom, he was appointed High Commissioner to the United Kingdom and accredited as Fiji's ambassador to Denmark, Egypt, Germany, Israel and the Holy See. He was later appointed Fiji's roving ambassador and high commissioner to the member states of the South Pacific Forum, before taking up a post as Permanent Secretary for Foreign Affairs and External Trade in 1999.

In the aftermath of the failure of the Fiji coup of 2000, a coup which Nailatikau strongly opposed, he was nominated for the position of Prime Minister, to help rebuild Fiji's shattered institutions. He withdrew his nomination, however, in favour of Laisenia Qarase, who was considered more of a consensus candidate, but became Deputy Prime Minister and Minister for Fijian Affairs in the interim Cabinet. He was appointed Deputy Prime Minister in August 2000. He was appointed again Deputy Prime Minister of Laisenia Qarase in 2001 and served until September 2001, when he was elected the Speaker. In 2001, after democracy had been restored in a general election, he defeated, by a vote of 41 to 29, Joeli Kalou for the position of Speaker of the House of Representatives, a position he held until after the 2006 elections.

Following the coup d'état of 5 December 2006, he was sworn in as Minister for Foreign Affairs and External Trade in the new interim government of Prime Minister Commodore Frank Bainimarama on 8 January 2007.

He was nominated to become the new vice-president by the Fiji president Ratu Josefa Iloilo on 10 April 2007, but was rejected by the GCC. On 17 April 2009, after Fiji experienced a constitutional crisis, Ratu Epeli was appointed vice president.