Waldo is a masculine given name. It derives from the Anglo-Saxon name Waltheof. It may refer to:
People Waldo of Reichenau (740–814), Carolingian abbot and bishop Waldo Colburn (1824–1885), American politician Waldo Díaz-Balart (1931–2025), Cuban-born painter and sculptor Ralph Waldo Emerson (1803–1882) American writer and philosopher Waldo A. Evans (1869–1936), American naval captain and military governor Waldo Frank (1889–1967), American novelist, historian, and critic Waldo Grant (1946–2023), American serial killer Waldo E. Harder (1918–1976), president of Grace University M. Waldo Hatler (1894–1967), American soldier and Medal of Honor recipient Waldo Hutchins (1822–1891), U.S. Congressman Waldo P. Johnson (1817–1885), U.S. senator and Confederate congressman Waldo Kantor (born 1960), Argentine volleyball player Waldo K. Lyon (1914–1998), U.S. Navy physicist Waldo Machado (1934–2019), Brazilian former footballer Waldo McBurney (1902–2009), credited as "America's Oldest Worker" Waldo Ponce, Chilean football player Waldo de los Ríos (1934–1977), Argentine composer and conductor Waldo Salt (1914–1987), American screenwriter Waldo E. Sexton (1885–1967), American businessman Waldo R. Tobler (1930–2018), American-Swiss geographer Waldo Williams (1904–1971), Welsh language poet
Fictional characters Waldo, the main character in the Where's Waldo? children's book franchise Waldo Faldo, a character from the television series Family Matters