Zlosyň is a municipality and village in Mělník District in the Central Bohemian Region of the Czech Republic.

According to a record from 1654, the village was probably destroyed during the Thirty Years' War and later restored.

For centuries, the village was agricultural, but in the 19th century, residents began to commute to work in nearby industrial centres.

[3] The D8 motorway from Prague to Ústí nad Labem passes through the municipality.

The main landmark of Zlosyň and the most valuable building is the Baroque granary.