Štefan Tiso (October 18, 1897 – March 28, 1959) was a lawyer and president of the Supreme Court of the 1939–1945 Slovak Republic which was a puppet state of Nazi Germany. He was a cousin of Josef Tiso, the president of the Republic.
Tiso war born in Nagybiccse, Kingdom of Hungary.
He became prime minister (replacing Vojtech Tuka), Foreign Minister (replacing also Vojtech Tuka) and minister of Justice (replacing Gejza Fritz) of the Slovak Republic. In the latter position in 1944 he pressed for death sentences against leaders of the pro-allied Slovak National Council. Tiso also emphasized his desire to see a Final Solution to the Jewish Question in Slovakia, in discussions with , the commander of Einsatzgruppe H. He believed that the uprising was the work of Judeo-Bolshevik plotters and considered Jews "enemies of the state".
In a postwar trial, Štefan Tiso was given a life sentence. He died in prison in Mírov, Czechoslovakia.