Justo () is a Spanish surname and male given name meaning just, i.e. fair.

Given name Notable people with this given name include:

Justo Albarracín (born 1951), Argentine equestrian Justo Almario (born 1949), Colombian musician Justo José Caraballo (1914–2003), Argentine swimmer Justo Daract (1804–1887), Argentine politician Justo de Santa María de Oro (1772–1836), Argentine statesman and bishop Justo Figuerola (1770–1854), Peruvian president Justo Gallego Martínez (born 1925), Spanish monk Justo Giani (born 1999), Argentine football player Justo Iturralde (1905–1981), Argentine equestrian Justo Jacquet (born 1961), Paraguayan football player Justo Jorge Padrón (1943–2021), Spanish poet, essayist and translator Justo José de Urquiza (1801–1870), Argentine general and politician Justo L. González (born 1937), Cuban theologist Justo Oscar Laguna (1929–2011), Argentine bishop Justo Pastor Lynch (1755–1830), Argentine landowner Justo Lorente (born 1994), Nicaraguan football player Justo Páez Molina (1902–1969), Argentine politician Justo Pastor Benítez (1897–1963), Paraguayan historian and politician Justo Perelló (born 1939), Cuban javelin thrower Justo Rufino Barrios (1835–1885), Guatemalan politician Justo Sierra (1848–1912), Mexican writer Justo Suárez (1909–1938), Argentine boxer Justo Tejada (born 1933), Spanish football player Justo Takayama (1552–1615), Japanese Christian and samurai Justo Villar (born 1977), Paraguayan football player

Middle name Antonio Justo Alcibar (born 1944), Argentine football player José Justo Corro (1794-1864), Mexican president José Justo Milla (1794–1838), Honduran military leader

Surname Notable people with this surname include: Agustín Pedro Justo (1876–1943), Argentine president Alicia Moreau de Justo (1885–1986), Argentine physician and politician Juan B. Justo (1865–1928), Argentine physician, journalist and politician Sara Justo (1870–1941), Argentine women's rights activist and dentist Virginia Justo (born 1963), Argentine chess master