Fidel Alejandro Castro Ruz, a Cuban revolutionary and politician, led Cuba for nearly five decades, from 1959 to 2008, as prime minister and then president. He was born in Birán in 1926, the son of a wealthy Spanish farmer. Castro adopted leftist and anti-imperialist ideas while studying law at the University of Havana. His revolutionary journey began with the failed attack on the Moncada Barracks in 1953, leading to imprisonment and subsequent formation of the 26th of July Movement in Mexico. Returning to Cuba, he played a pivotal role in the Cuban Revolution, overthrowing President Fulgencio Batista in 1959 and assuming military and political power. Castro's leadership saw Cuba transform into a one-party communist state, aligning with the Soviet Union and facing off against the United States during the Cuban Missile Crisis. He implemented socialist reforms, supported revolutionary groups globally, and led Cuba through the economic downturn of the "Special Period." Castro's legacy is polarizing, praised by supporters for advancing socialist ideals and criticized by opponents for human rights abuses and economic struggles in Cuba. His impact on Cuba and global politics remains a topic of historical and political debate.

Fidel Junior Barajas Juárez, born on April 5, 2006, is a talented professional footballer known for his skills as a winger. He currently plays for Major League Soccer club D.C. United, on loan from Liga MX side Guadalajara, and represents the Mexico national team. Barajas began his club career with USL Championship club Charleston Battery, where he made a notable impact by scoring his first professional goal and earning a spot in the USL Championship Team of the Week. His impressive performances continued, leading to his recognition by English newspaper The Guardian as one of the best players born in 2006 worldwide. After a successful stint with Charleston Battery, Barajas joined Major League Soccer side Real Salt Lake and later moved to Liga MX club Guadalajara. In addition to his club achievements, Barajas has also made significant contributions to the Mexico U17 national team, helping them win the CONCACAF U-17 Championship in 2023 and securing qualification for the FIFA U-17 World Cup. With a promising career ahead, Barajas has already garnered multiple individual and team honors, showcasing his immense potential and talent in the world of football.

Fidel Henderson Edwards, born on 6 February 1982, is a Barbadian cricketer known for his prowess in all formats of the game. With a round-arm action akin to former cricketer Jeff Thomson and Lasith Malinga, Edwards caught the eye of Brian Lara, leading to his Test debut against Sri Lanka after just one match for Barbados. He was part of the West Indies team that clinched the 2012 T20 World Cup. Despite a promising start, injuries and inconsistency have hindered his Test career, reflected in his average of just under 40. Edwards has showcased his talent in various domestic and T20 franchises, including the Rajasthan Royals in IPL 2013 and the Deccan Chargers in 2009. He made his first-class debut in 2002 and has been a key player in several leagues, such as the Bangladesh Premier League and the Global T20 Canada tournament. Edwards has battled injuries throughout his career, undergoing back surgery and experiencing setbacks, but he made a strong comeback in the 2010-11 West Indian cricket season, proving his fitness and contributing significantly to the team. He has been a consistent performer and a valuable asset in the cricketing world.

Fidel Pagés Miravé (26 January 1886 – 21 September 1923) was a Spanish military surgeon known for his pioneering work in developing the technique of epidural anesthesia. Born in Huesca, Spain, he pursued his medical studies at the University of Zaragoza, where he graduated with honors in Medicine and Surgery in 1908. Pagés joined the Army Medical Corps in 1908 and served in various capacities, gaining invaluable experience in emergency surgery during the second Rif War. His contributions to modernizing surgery in Spain and advocating for early emergency interventions for abdominal injuries based on his war experiences are noteworthy.Pagés' expertise and dedication led to numerous publications and his appointment as the editor in chief of the "Revista de Sanidad Militar" (Journal of Military Health). In 1919, he co-founded the "Revista Española de Cirugía" (Spanish Journal of Surgery) and made significant contributions to the field of anesthesia, particularly in advocating for early emergency interventions for abdominal injuries.Despite his significant contributions, Pagés' pioneering work in epidural anesthesia went unnoticed for many years outside of Spanish-speaking countries due to his untimely death in 1923. His legacy lives on, and his contributions to the field of surgery and anesthesia continue to be recognized and celebrated.

Fidel Castro (1926–2016) was a prominent communist revolutionary leader of Cuba. He played a pivotal role in shaping the course of Cuban history and politics. Fidel Castro Díaz-Balart (1949–2018) was a Cuban nuclear physicist and government official. His contributions to the scientific and political spheres left a lasting impact on Cuba. The legacy of Fidel Castro extends beyond his political career, with various entities such as the Fidel Castro Secondary School in Tanzania and numerous other things bearing his name. Whether controversial or celebrated, Fidel Castro's influence is undeniable, and his life continues to be a subject of interest and debate.