Peter Fenger (23 October 1719 – 24 December 1774) was a Danish merchant and slave trader.

He came to Copenhagen in an early age where he became an apprentice in Johan Friederich Wewer's trading house.

In spite of his lack of experience as a company trader, he was hired by the Danish Asiatic Company as 1st supercargo on board the Dronning Juliana Maria on her expedition to Canton in 1753, Back in Copenhagen, in 1755, he began a partnership with Peter Borre under the name Borre & Fenger.

The company traded in a wide array of products, including salt, flax, hemp and coal, spices, sugar and other colonial goods.

The company was based in the Irgens House and constructed the building at Overgaden neden Vandet 51 in 1761–1762.