Oswaldo Goeldi (31 October 1895 – 16 February 1961) was a Brazilian artist and renowned engraver. He was the son of Swiss naturalist Émil Goeldi.
Goeldi was born in born in Rio de Janeiro, but lived in Belém, in the state Pará, until he was 6 years old. His father was based there as director of the Museu de História Natural e Etnografia do Pará (presently the Emílio Goeldi Museum). In 1910 his family returned to Switzerland and he started his studies in Bern, and later in Zurich. After serving for a brief period in the army during the First World War, Goeldi moved to Geneva, where he was accepted at the École des Arts et Métiers. Frustrated with the academic environment, he abandoned the school after his father’s death in 1917 and began studying with artists Serge Pahnke (1875-1950) and Henri van Muyden (1860-s.d.), and later with Hermann Kümmerly, with whom he learned lithography.
In 1919 Goeldi returned to Rio de Janeiro and began a career of engraver and illustrator for popular magazines. He became attached to a group of vanguardist artists and intellectuals, such as Beatrix Reynal, Aníbal Machado (1894-1964), Otto Maria Carpeaux (1900-1978), Manuel Bandeira (1884-1968), Álvaro Moreyra (1888-1964), Ronald de Carvalho (1893-1935), Emiliano Di Cavalcanti (1897-1976) and Rachel de Queiroz (1910-2003). During this period, he worked intensely as an artist and did his first individual exposition, which was, however, poorly received by the art critics. Wounded by the criticisms, Goeldi withdrew from the artistic scene and isolated himself in the city of Niterói. Solitary, he supported himself more and more as a well known illustrator for book editions and magazines, working mainly with xylogravures. He also became estranged from his family in 1922, refusing their appeal to return to Europe. He took part in the Week of Modern Art in São Paulo that year. His first album, “10 Gravuras em Madeira” was edited in 1930, allowing Goeldi to save enough money to return to Europe en 1931. He exposed in Bern and Berlin, and visited again his great inspirators, Alfred Kubin and Hermann Kümmerli.