Gertrud of Süpplingenburg (18 April 1115 – 18 April 1143) was the only child of Emperor Lothar III (Lothar of Süpplingenburg), Duke of Saxony, and his wife Richenza of Northeim.
On 29 May 1127, she married the Welf, Henry the Proud, who had been Duke of Bavaria since 1126. After the death of his father-in-law, Henry also became Duke of Saxony. He and Gertrud were the parents of Henry the Lion, Duke of Saxony and Bavaria.
After Henry's death in 1139, Gertrud married again, on 1 May 1142, to Henry II, the Margrave of Austria (died 1177).
She died on 18 April 1143, which was her 28th birthday. Henry later married his second wife, Theodora Komnene.
| German royalty | ||
|---|---|---|
| Preceded by Richenza of Northeim |
Duchess of Saxony 4 December 1137 – 20 October 1139 |
Succeeded by Sophie of Winzenburg |
| Vacant
Title last held by
Wulfhilde of Saxony |
Duchess of Bavaria 1st time 4 December 1137 – 20 October 1139 |
Vacant
Title next held by
Maria of Bohemia |
| Vacant
Title last held by
Beatrice of Bar |
Margravine of Tuscany 4 December 1137 – 20 October 1139 |
Vacant
Title next held by
Uta of Schauenburg |
| Vacant
Title last held by
Maria of Bohemia |
Duchess of Bavaria 2nd time 1 May 1142 – 18 April 1115 |
Vacant
Title next held by
Theodora Komnene |
| Margravine of Austria 1 May 1142 – 18 April 1115 |
||