| Finnish: Lassila | |
| Other Name: | Swedish: Lassas |
| Settlement Type: | Helsinki Subdivision |
| Subdivision Type: | Country |
| Subdivision Name: |  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 |
| Total Type: | |
| Area Total Km2: | 1.29 |
| Population Total: | 4,089 |
| 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.