George I, Duke of Brieg (Brzeg) (Polish: Jerzy I brzeski; 1481 or 1483 – 30 May 1521), was a Duke of Legnica during 1488–1505 (with his brother as co-ruler) and of Brzeg since 1505 until his death.

He was the third and youngest son of Frederick I, Duke of Chojnów-Oława-Legnica-Brzeg-Lubin, by his wife Ludmila, daughter of George of Poděbrady, King of Bohemia.

After the death of his father in 1488, George I and his two older brothers John II and Frederick II succeeded him in Legnica, Chojnów and Lubin; but because all were minors, the regency was held by their mother, the Dowager Duchess Ludmila, who received from her late husband Brzeg and Oława as dower until her death.

Dowager Duchess Ludmila died in 1503 and their domains of Brzeg and Oława were inherited by his sons, who continued as co-rulers for another two years, until 1505, when they finally decided to make the division of their lands.

They had no children and for this, on his death George I was succeeded by his brother Frederick II only in Brzeg, because Lubin was granted to Dowager Duchess Anna as dower.