Sestiere di Porta Orientale, Medieval district in central Milan, Italy.

Sestiere di Porta Orientale is one of the six historic sestieri of Milan, bounded by the Cerchia dei Navigli, the line of the medieval walls whose moat the ring followed. It takes its name from the medieval Porta Orientale, demolished in 1818, which stood along the road to Bergamo, Brescia and Verona. Its five contrade are documented, and its emblem, a lion, appears on the Loggia degli Osii in Piazza Mercanti.

The sestiere takes its name from the medieval Porta Orientale, demolished in 1818, which itself replaced the Roman Porta Orientale built into the republican walls, probably under Octavian after Mediolanum became a municipium in 49 BC. From that gate a road ran east through Bergomum and Brixia to Verona. After 290, when Maximilian made Mediolanum capital of the Western Empire and extended the walls northeast, the gate fell inside the city and Porta Argentea took over its role.

The sestiere was divided into five contrade, but the sources name none of them and give no symbols for them. What the sources do record is the district's own emblem: a lion, shown rampant on the coats of arms carved on the Loggia degli Osii in piazza Mercanti, built in 1316. The same rampant pose appears in the Cremosano Codex, where the lion is gold on a white field, while Bonvesin de la Riva, Galvano Fiamma and Bernardino Corio describe a black lion on white. The lion probably recalls the stone lion on top of the column still standing in piazza San Babila.

Multiple metro stations and bus stops connect the district to other parts of Milan, making it convenient to explore on foot and reach nearby neighborhoods. The area is best explored during daytime when streets are most active and easiest to navigate.

The coat of arms features a black lion on a white field, a symbol documented by historian Galvano Fiamma and carved into the Loggia degli Osii. This heraldic image represents the visual identity that has marked the area's character across centuries.