Arnaldo is a given name. Notable people with the name include:
Arnaldo Abrantes (born 1986), Portuguese track and field sprinterArnaldo Alonso (born 1979), Paraguayan footballerArnaldo André (born 1943), soap-opera Paraguayan actorArnaldo Andreoli (1893–1952), Italian gymnast who competed in the 1920 Summer OlympicsArnaldo Maria Angelini (1909–1999), Italian scientist, working with Italy's power generationArnaldo Antunes (born 1960), writer and composer from BrazilArnaldo Baptista (born 1948), Brazilian rock musician and composerArnaldo Villalba Benitez (born 1978), Paraguayan footballerArnaldo Bonfanti (born 1978), footballerArnaldo Carli (1901–1972), Italian racing cyclist and Olympic championArnaldo Carvalho de Melo, Brazilian developer working on the Linux kernelArnaldo Cézar Coelho (born 1943), the first Brazilian to take charge of the FIFA World Cup finalArnaldo Cohen, Brazilian pianistArnaldo da Silva (born 1964), former Brazilian athleteArnaldo de Oliveira Sales, GBM, OBE, JP, Chairman of the Hong Kong Olympic AcademyArnaldo Deserti (born 1979), Italian water polo playerArnaldo Edi Lopes da Silva (born 1982), Portuguese footballer of Guinea-Bissauan descentArnaldo Espínola (born 1975), Paraguayan footballerArnaldo Faustini (1872–1944), Italian polar geographer, writer, and cartographerArnaldo Ferraro (born 1936), former Republican Party politician from Brooklyn, New YorkArnaldo Forlani (born 1925), Italian politician and 44th Prime Minister of ItalyArnaldo Freire, Brazilian guitarist, teacher, cultural producer and composerMario Arnaldo Gómez (born 1981), Honduran footballerArnaldo Jabor (born 1940), Brazilian film director, screenwriter and producerArnaldo Ramos Lauzerique, Cuban independent economistArnaldo Tamayo Méndez (born 1942), the first Cuban citizen to travel into earth orbitArnaldo Mesa (born 1967), retired boxer from Cuba and Olympic silver medallistArnaldo Momigliano KBE (1908–1987), Italian historian known for his work in historiographyArnaldo Ochoa (1930–1989), Cuban general executed after being found guilty of treasonArnaldo Ortelli, Swiss footballer and squad member for Switzerland in the 1934 FIFA World CupArnaldo Otegi (born 1958), Basque politician, spokesman for the outlawed Abertzale Basque separatist party BatasunaArnaldo Ouana (born 1969), retired Mozambique international football playerArnaldo Pérez (born 1958), former butterfly and freestyle swimmer from Puerto RicoArnaldo Pambianco (born 1935), Italian former professional road racing cyclistArnaldo Pereira (born 1985), Paraguayan footballerArnaldo Pomodoro, Italian sculptorJavier Arnaldo Portillo (born 1981), Honduran football playerArnaldo Orfila Reynal (1897–1997), Argentine chemist and academicArnaldo Ribeiro (1930–2009), Roman Catholic Archbishop in Ribeirão Preto, BrazilArnaldo Darío Rosado (1953–1978), activist for the independence of Puerto Rico from a very young ageArnaldo Salvi (born 1915), Italian professional football playerArnaldo Santos, Puerto Rican reggaeton and rock producer, singer and guitaristArnaldo Sentimenti (1914–1997), former Italian football player and coachArnaldo Silva (born 1944), former Portuguese footballer who played as midfielderArnaldo Villalba (born 1978), Paraguayan footballer