Hendrick Conrad Joannes Heusken (January 20, 1832 – January 15, 1861) was a Dutch-American interpreter for the first American consulate in Japan, established at Gyokusen-ji in Shimoda, Shizuoka in the late Edo period. He became a popular member of the delegation, and his assassination by anti-foreigner rōnin helped sparked a diplomatic crisis between Japan and the western nations attempting to open it for trade.