Henry V of Brunswick-Wolfenbüttel, called the Younger,, a member of the House of Welf, was Duke of Brunswick-Lüneburg and ruling Prince of Brunswick-Wolfenbüttel from 1514 until his death. The last Catholic of the Welf princes, he was known for the large number of wars in which he was involved and for the long-standing affair with his mistress Eva von Trott.

The House of Welf is a European dynasty that has included many German and British monarchs from the 11th to 20th century and Emperor Ivan VI of Russia in the 18th century. The originally Franconian family from the Meuse-Moselle area was closely related to the imperial family of the Carolingians.