| Finnish: Viikki | |
| Other Name: | Swedish: Vik |
| 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: | Northeastern |
| Parts Type: | Subdivision regions |
| Parts Style: | para |
| Total Type: | |
| Area Total Km2: | 8.05 |
| Population Total: | 15,177 |
| Population As Of: | 2019 |
| Population Density Km2: | 682 |
| Postal Code Type: | Postal codes |
| Postal Code: | 00530, 00790 |
| Blank Name Sec1: | Subdivision number |
| Blank Info Sec1: | 36 |
| Blank1 Name Sec1: | Neighbouring subdivisions |
| Blank1 Info Sec1: | Toukola, Koskela, Vanhakaupunki, Oulunkylä, Malmi, Herttoniemi, Vartiokylä, Mellunkylä |
Viikki (Swedish: '''Vik''') is a neighbourhood of about 15,000 inhabitants in Helsinki, Finland. It is located at the bottom of Vanhankaupunginlahti bay, some 7–10 km from the city centre.
The district hosts the Viikki Campus with four of the faculties of the University of Helsinki (biosciences, pharmacy, veterinary medicine, and agriculture and forestry) as well as other university units such as research centres, science library and teacher training school.
Viikki is known for its natural environment. The conservation area of Vanhankaupunginlahti is an important place of nesting and migration for birds. Large fields and farmlands are cultivated by a teaching farm that is part of the university's agricultural faculty. Southernmost part of the Latokartano residential zone is known as an "ecological housing" area. Many apartment buildings there have, for instance, experimental solar and wind energy systems installed.
Viikki is divided into the sub-areas of Viikki science park, Latokartano, Viikinranta and Viikinmäki. In the 2000s the population of the district has increased steadily. This is because some areas of Viikki — especially in Latokartano and Viikinmäki — have been among the most important sites in Helsinki for the construction of new apartments.
A single-track non-passenger municipal railway line ran through the district, connecting to the state railways main-line at Oulunkylä railway station. This line runs to the Helsinki Metro depot in Roihupelto, but was originally the former Herttoniemi Harbour railway. The depot link features street running along the roads through Viikki. This line has been broken up during the summer of 2014.
The Raide-Jokeri also known as Jokeri Light Rail is a Passenger Light Rail Line that begun construction near the start of 2019 and is estimated to finish around 2024, where it will begin operation between Itäkeskus and Keilaniemi that replaces the Current Trunk Bus Route 550. It will run through central viikki, passing the University and the Viikki Science Park.
