Richenza of Northeim (c. 1087/1089 – 10 June 1141) was Duchess of Saxony from 1106, Queen of Germany from 1125 and Holy Roman Empress from 1133 as the wife of Lothair of Supplinburg.

[1] After Lothair was elected King of the Romans in 1125, Richenza was crowned queen by Archbishop Frederick I of Cologne.

Lothair died in 1137, and Richenza moved swiftly to ensure the lands of Saxony went to her son-in-law, Duke Henry the Proud.

Richenza fought hard for the inheritance of her grandson Henry the Lion, seeing to his education, and pushing for his right to be regarded as the heir to the Saxon duchy.

She died in 1141 and was buried next to her husband Emperor Lothair and her son-in-law Duke Henry the Proud in the Imperial Cathedral at Königslutter.