|Catherine of Brunswick-Wolfenbüttel|
|Duchess consort of Saxe-Lauenburg|
|Tenure||20 November 1509 - 1 August 1543|
|Died||29 June 1563|
Neuhaus upon Elbe
|Spouse||Magnus I, Duke of Saxe-Lauenburg|
|Issue||Francis I, Duke of Saxe-Lauenburg|
Dorothea, Queen of Denmark and Norway
Catherine, Queen of Sweden
Clara, Duchess of Brunswick-Gifhorn
Sophie, Countess of Oldenburg and Delmenhorst
Ursula, Duchess of Mecklenburg-Scherwin
|House||House of Welf (by birth)|
House of Ascania (by marriage)
|Father||Henry IV, Duke of Brunswick-Lüneburg|
|Mother||Catherine of Pomerania|
She married on 20 November 1509 in Wolfenbüttel Duke Magnus I of Saxe-Lauenburg (1470-1543). Her father summoned the Parliament in 1509 to collect a lady tax, because he found himself unable to pay the dowry alone. Only after long negotiations, did the Parliament grant three rounds of real estate tax, to generate for money for a dowry and jewels for the princess.
Catherine was a strict Catholic with close ties to her relative in Brunswick kin. This induced Gustav I of Sweden, to marry her daughter, in an attempt to the Catholic German princes from supporting of King Christian II of Denmark.
At the marriage of her eldest son, she entered into negotiations with his later mother-in-law Catherine of Mecklenburg, without the knowledge and to the detriment of the Wettin family head John Frederick of Saxony.
From her marriage, Catherine had the following children: