Johan Christian Castberg (1 February 1911 – 1988) was a Norwegian illustrator and painter.
He was born in Bergen to Ida Anker and Torgrim Castberg, and was married twice, to Fredrikke Mustad, and to pianist Ingrid Kjellstrøm.In the 1930s and 1940s Castberg worked as illustrator in Norwegian and Swedish newspapers.
After the Second World War he established himself as portrait painter.