Adolf (Aatto) Suppanen (born 15 April 1855 in Ruskeala, Grand Duchy of Finland, Russian Empire d. 3 February 1898 in Helsinki) was a Finnish writer, journalist and translator. He used the nom de plume of Aatto S.
By the late 1800s Suppanen had become a prolific translator into Finnish, primarily from Swedish and German, and he was the first professional literary translator into Finnish. Two well-known English-language works that he translated were Lew Wallace's Ben-Hur (Ben-Hur: kertomus Kristuksen ajoilta), and Harriet Beecher Stowe's Uncle Tom's Cabin (Setä Tuomon tupa)
On 1 June 1882, he married Alma Erika Henriette Bonsdorff (1851–1937), from Jokioinen, the daughter of Erik Napoleon Bonsdorff (1805–1870) and Henriette Rotkirch (1808–1851). The couple had four children, Aino (b. 1884), Toini (b. 1885), Viljo (b. 1887) and Alma (b. 1888).
