Koldo is a Basque masculine given name. Notable people with this name include:
Koldo Aguirre (1939–2019), Spanish football player Koldo Álvarez (born 1970), Andorran footballer and manager Koldo Fernández (born 1981), Spanish cyclist Koldo Gil (born 1978), Spanish cyclist Koldo Gorostiaga Atxalandabaso (born 1940), Spanish politician Koldo Izagirre (born 1953), Spanish writer Koldo Mitxelena (1915–1987), Basque linguist Koldo Obieta (born 1993), Spanish footballer Koldo Olabarri (born 1992), Spanish actor Koldo Serra (born 1975), Spanish director Koldo Zuazo (born 1956), Basque linguist