Frederick II of Hohenstaufen (1090 – 1147) was duke of Swabia, succeeding his father, duke Frederick I in 1105. In 1121 married Judith of Bavaria, a member of the powerful House of Guelph.

On the death of Emperor Henry V, his uncle, Frederick stood for election as King of Germany with the support his younger brother Conrad of Swabia and several houses. However, he lost this election of 1125 to Lothar II, crowned Emperor later in 1133.

Frederick's descendents were:

• From Judith of Bavaria (1100-1132)
  • Frederick III Barbarrossa (1122-1190), duke of Swabia and Holy Roman Emperor as Frederick I
  • Bertha of Hohenstaufen (1123-1195), married Matthias I, Duke of Lorraine
• From Agnes of Saarbrücken (d.~1147)
  • Conrad of Hohenstaufen, Palatine Count of the Rhein (1134-1195)
  • Judith of Hohenstaufen (1135-1191), married Ludwig II, Duke of Thuringia

See also: Dukes of Swabia family tree