Jacob Ephraim Polzin (1778 – 18 November 1851) was a German Neoclassical architect active in Bremen, Germany.

He trained in Copenhagen and quickly found work for three years helping to construct the new Christiansborg Palace which Christian Frederik Hansen had designed.

In 1811 he moved to Bremen[1] where he married the daughter of the local master carpenter in 1814.

Polzin had worked on re-designing the town's marketplace notwithstanding the French occupation.

Polzin worked on the creation of the new street and buildings which were created as the town walls were abandoned.