Juan Martínez may refer to:

• Juan Martínez Montañés (1568–1649), sculptor of the Spanish Golden Age
• Juan Martínez de Jáuregui y Aguilar (1583–1641), poet and painter of the Spanish Golden Age
• Juan Martínez Abades (1862–1920), Spanish painter
• Juan Martínez Gutiérrez (1901–1976), Chilean architect
• Juan Luis Martínez (1942–1993), Chilean poet and writer

• Juan Martínez de Medrano (died 1337-1338) Navarrese politician, regent of the Kingdom of Navarre, lieutenant of the Governor of Navarre, ricohombre, Baron and Lord of Sartaguda

• Juan Martínez de Ampiés (died 1533), Spanish army officer, first governor of Venezuela Province
• Juan Martínez de Rozas (1759–1813), Chilean lawyer and politician
• Juan Antonio Martínez (died 1854), interim President of Guatemala
• Juan Ramón Martínez (politician) (born 1941), Honduran newspaper columnist and politician
• Juan Manuel Martínez Nava (born 1954), Mexican politician
• Juan Antonio Martínez Varela (fl. 1999–2004), Salvadoran defense minister

• Juan Martínez (bishop of Lugo) (fl. 1277–1281), Galician clergyman
• Juan Martínez Silíceo (1486–1557), Spanish Roman Catholic bishop, cardinal and mathematician
• Juan Manual Martínez de Manzanillo (died 1592), Venezuelan Roman Catholic bishop
• Juan Martínez de Ripalda (1594–1668), Spanish Jesuit theologian

• Juan Ramón Martínez (footballer) (born 1948), Salvadoran footballer
• Juan Martínez Martínez (born 1955), Spanish footballer, and current coach of CD Castellón
• Juan Ignacio Martínez (born 1964), Spanish footballer
• Juan Martínez Munuera (born 1982), Spanish football referee
• Juan Martínez Marconi (born 1982), Chilean footballer
• Juan Manuel Martínez (born 1985), Argentine footballer
• Juan Carlos Martínez Camarena (born 1991), Mexican footballer
• Juan David Martínez (born 2001), Colombian footballer

• Juan Máximo Martínez (1947–2021), Mexican long-distance runner
• Juan Martínez Brito (born 1958), Cuban discus thrower
• Juan Martínez Martin (born 1980), Spanish track and field athlete

• Juan Martínez (swimmer) (born 1946), Spanish swimmer
• Juan Martínez (canoeist born 1950), Mexican sprint canoer who competed in the 1960s and 1970s
• Juan Martínez (1990s canoeist), Mexican sprint canoer who competed in the 1990s

• Juan Antonio Martínez (fencer) (born 1920), Cuban fencer
• Juan Martínez (equestrian) (1924–1994), Spanish Olympic equestrian
• Juan Antonio Martínez (basketball) (born 1944), Spanish basketball player
• Juan Tomás Martínez (born 1962), Spanish cyclist
• Juan Martínez Oliver (born 1964), Spanish road bicycle racer
• Juan Martínez de Irujo (born 1981), Spanish Basque pelota player

• Juan Martínez de Recalde (c.1540–1588), Spanish naval officer
• Juan Martinez, managing partner of Australian law firm HWL Ebsworth

• Portrait of Juan Martínez Montañés, Spanish oil painting by Diego Velázquez

• San Juan y Martínez, a municipality and town in the Pinar del Río Province of Cuba