Louis the Roman (German: Ludwig VI der Römer) (7 May 1328 – 17 May 1365) was the eldest son of Holy Roman Emperor, Louis IV the Bavarian, by his second wife, Margaret II, Countess of Hainaut, and a member of the House of Wittelsbach.

Louis released Holland and Hainaut for his brothers William I and Albert I in 1349, since he expected to acquire the Polish crown by his in 1345 marriage with Cunigunde of Poland, a daughter of Casimir III and Aldona Ona of Lithuania.

Less experienced than Louis V, he was also challenged by the "False Waldemar", an impostor who claimed Brandenburg and got support from several cities and Holy Roman Emperor Charles IV until the Wittelsbachs came to terms with Charles.

She was a daughter of Albert II, Duke of Mecklenburg, and Euphemia of Sweden.

Louis had no children with her, either, thus his younger brother Otto V succeeded him in Brandenburg.