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Counties Palatine of Simmern and Zweibrücken Pfalzgrafschaft Simmern und Zweibrücken
1410–1459
Coat of arms
Status	State of the Holy Roman Empire
Capital	Zweibrücken
Government	Principality
Historical era	Middle Ages
• Partitioned from     Electoral Palatinate	1410
• Inherited Veldenz	1444
• Inheritance partitioned	1444
• Partitioned in twain on     death of Stephen	1459
Preceded by Succeeded by Electoral Palatinate County Palatine of Veldenz House of Palatinate-Simmern Palatine Zweibrücken

Palatinate-Simmern and Zweibrücken (German: Pfalz-Simmern-Zweibrücken) was a state of the Holy Roman Empire based in the Simmern and Zweibrücken in modern Rhineland-Palatinate, Germany.

Palatinate-Simmern and Zweibrücken was created in 1410 out of the partition of the Palatinate after the death of King Rupert III for his son Stephen. In 1444 the County of Veldenz was added to the state but later in the year Stephen partitioned his territories between his sons Frederick (who received Simmern) and Louis (who received Zweibrücken and Veldenz). In 1448, Stephen inherited half the territories of Palatinate-Neumarkt but sold them to Palatinate-Mosbach.

• Stephen, 1410–59