Lassila (Finnish), Lassas (Swedish) is a neighborhood in western Helsinki, Finland. It was mostly developed in the 1980s and 1990s.

Lassila
Lassas
Position of Lassila within Helsinki
Position of Lassila within Helsinki
Country Finland
RegionUusimaa
Sub-regionGreater Helsinki
MunicipalityHelsinki
DistrictWestern
Area
1.29 km2 (0.50 sq mi)
Population
4,089
 • Density3,170/km2 (8,200/sq mi)
Postal codes
00440, 00441
Subdivision number294
Neighbouring subdivisionsKannelmäki, Pirkkola, Pohjois-Haaga, Etelä-Haaga, Pitäjänmäen teollisuusalue, Marttila, Reimarla