Stefan of Simmern-Zweibrücken (German: Stefan Pfalzgraf von Simmern-Zweibrücken) (23 June 1385 – 14 February 1459, Simmern) was Count Palatine of Simmern and Zweibrücken from 1410, and Count to Veldenz and Sponheim from 1444.
He was the son of King Rupert of Germany and his wife Elisabeth of Nuremberg. After the death of Rupert the Palatinate was divided between four of his surviving sons. Louis III received the main part, Johann received Pfalz-Neumarkt, Stefan received Pfalz-Simmern and Otto received Pfalz-Mosbach.
In 1410 Stefan married Anna von Veldenz[1], who died in 1439[2]. After the death of Anna's father in 1444[3], Stefan also gained control of Veldenz and consequently of the Veldenzer share on Sponheim. In the same year, he also divided the country between his sons Frederick I, who became the Count Palatine of Simmern, and Louis I, who became the Count Palatine of Zweibrücken. In 1448 he succeeded to one part of Pfalz-Neumarkt and purchased the other from Otto[citation needed].
He was buried in the cathedral of the Teutonic Knights in Meisenheim[citation needed].
Stefan of Simmern-Zweibrücken and Anna von Veldenz had four children[1]: