Pikku Huopalahti (Swedish: Lillhoplax) is a neighbourhood in the West of Helsinki between the Ruskeasuo neighbourhood and Mannerheimintie (one of the main streets in Helsinki) in the east, the Meilahti neighborhood in the South, the Niemenmäki neighborhood and Huopalahdentie street in the West and the Vihdintie street and Etelä-Haaga neighborhood in the North.

Pikku Huopalahti Lillhoplax
Helsinki Subdivision
Position of Pikku Huopalahti within Helsinki
Country	Finland
Region	Uusimaa
Sub-region	Greater Helsinki
Municipality	Helsinki
District	Western
Area	2.12 km2 (0.82 sq mi)
Population	9,000
• Density	3,090/km2 (8,000/sq mi)
Postal codes	00300, 00270
Subdivision number	1505,1602,2916
Neighbouring subdivisions	Pasila, Munkkiniemi, Ruskeasuo, Meilahti, Munkkivuori, Etelä-Haaga, Niemenmäki,

The neighborhood name means in Finnish 'Tiny Felt Bay' (after the original name in Swedish, Lillhoplax, was phonetically but inaccurately translated into Huopalahti in Finnish), with a bay of the same name forming most of the neighborhood edge on its West side, surrounded by a large park. This bay extends out to the Gulf of Finland. Most of the housing in Pikku Huopalahti is residential apartment building, primarily built in the 1990s. Pikku Huopalahti is home to around 10.000 people.

As a neighborhood of Helsinki, Pikku Huopalahti finds itself as a Sui generis. Helsinki's subdivision system uniquely divides Pikku Huopalahti as belonging to 3 separate city districts. The southern part belongs to the Meilahti district and is numbered 1505. The eastern part belongs to the Ruskeasuo district and is numbered 1602 and the rest of Pikku Huopalahti belongs to the Haaga district and is numbered 2916.

The headquarters of McDonald's Finland is located in Pikku Huopalahti on Paciuksenkatu, in a large cylindrical building designed by Heikkinen-Komonen architects.

The final stop on Helsinki's 10 tram is also located in Pikku Huopalahti. The 4 tram travels on Paciuksenkatu to the south of Pikku Huopalahti on its way to Munkkiniemi but never actually enters the neighborhood.

The University of Helsinki has its Department of Dentistry, Institute for Oral Health, Department of Public Health and Department of Forensic Medicine campus in the North East corner of Pikku Huopalahti. As of 2015 the university has decided to relocate its facilities, so the existing buildings will be torn down and the City of Helsinki has prepared an area plan draft to redevelop the area.

The neighborhood is also known as having a 'Legoland' effect because the buildings, mostly constructed in the past 20 years, all prominently display basic geometric patterns such as circles, squares, and triangles on the residential housing. Also, the use of light pastel colors, mostly white, light blue, and turquoise, make Pikku Huopalahti a very distinct neighborhood compared to the other neighborhoods to the north and west that have more traditional housing stock from the 1940s and 1950s. The architecture and urban layout is said to reflect criticisms of modernism present in the "Oulu school" of architecture often associated with Reima and Raili Pietilä.

City districts partly forming and/or surrounding Pikku-Huopalahti are Meilahti, Munkkiniemi, Munkkivuori, Niemenmäki, Etelä-Haaga and Ruskeasuo.