Lassila
{{for|the surname|Lassila (surname)}}
{{Unreferenced|date=October 2021}}
{{Expand Finnish|topic=geo|date=December 2009|Lassila}}
{{Infobox settlement
| name = {{lang|fi|Lassila}}
| other_name = {{lang|sv|Lassas}}
| settlement_type = Helsinki Subdivision
| image_map = Lassila-Lassas.sijainti-läge.svg
| map_caption = Position of Lassila within Helsinki
| subdivision_type = Country
| subdivision_name = {{flag|Finland}}
| subdivision_type1 = Region
| subdivision_name1 = Uusimaa
| subdivision_type2 = Sub-region
| subdivision_name2 = Greater Helsinki
| subdivision_type3 = Municipality
| subdivision_name3 = Helsinki
| subdivision_type4 = District
| subdivision_name4 = Western
| parts_type = Subdivision regions
| parts_style = para
| p1 =
| total_type =
| area_total_km2 = 1.29
| population_total = 4,089
| population_as_of =
| population_footnotes =
| population_density_km2 = 3,170
| postal_code_type = Postal codes
| postal_code = 00440, 00441
| blank_name_sec1 = Subdivision number
| blank_info_sec1 = 294
| blank1_name_sec1 = Neighbouring subdivisions
| blank1_info_sec1 = Kannelmäki, Pirkkola, Pohjois-Haaga, Etelä-Haaga, Pitäjänmäen teollisuusalue, Marttila, Reimarla
}}
Lassila (Finnish), Lassas (Swedish) is a neighborhood in western Helsinki, Finland. It was mostly developed in the 1980s and 1990s.
{{coord missing|Finland}}
{{SouthernFinland-geo-stub}}