Vaasa (Finnish: [ˈʋɑːsɑ]; Swedish: Vasa, Finland Swedish: [ˈvɑːsɑ] , Sweden Swedish: [ˈvɑ̂ːsa] ), formerly known as Nikolainkaupunki, (Swedish: Nikolajstad; lit. 'city of Nicholas') is a city in Finland and the regional capital of Ostrobothnia. It is located on the west coast of the country, on the Gulf of Bothnia. The population of Vaasa is approximately 70,000, while the sub-region has a population of approximately 111,000. It is the 14th most populous municipality in Finland, and the tenth most populous urban area in the country.

Vaasa was granted its charter in 1606, during the reign of Charles IX of Sweden, and is named after the Royal House of Vasa. The city is renowned as a significant university and college city in Finland.

Vaasa is a bilingual municipality with Finnish and Swedish as its official languages. The population consists of 65% Finnish speakers, 23% Swedish speakers, and 12% speakers of other languages. The municipalities surrounding Ostrobothnia, such as Korsholm and Malax, have a clear majority of Swedish speakers. As a result, the Swedish language maintains a strong position in the city, making it the most significant cultural center for Swedish-Finns.

Vaasa is also home to Tropiclandia Water Park, located on Vaskiluoto Island adjacent to a local spa hotel. The now disassembled Wasalandia Amusement Park, which ceased operations in 2015 due to a small number of visitors, was located in the immediate vicinity of Tropiclandia.

Over the years, Vaasa has changed its name several times, due to alternative spellings, political decisions and language condition changes. At first it was called Mustasaari or Mussor after the village where it was founded in 1606, but just a few years later the name was changed to Vasa to honor the royal Swedish lineage. Mustasaari (Finnish) or Korsholm (Swedish) remains as the name of the surrounding mostly rural municipality, which since 1973 surrounds the city. The city was known as Vasa between 1606 and 1855, Nikolajstad (Swedish) and Nikolainkaupunki (Finnish) between 1855 and 1917, named after the then late Czar Nicholas I of Russia, Vasa (Swedish) and Vaasa (Finnish) after the February Revolution, with the Finnish spelling of the name being the primary one from around 1930 when Finnish speakers became the majority in the city.

The history of Korsholm and also of Vaasa begins in the 14th century, when seafarers from the coastal region in central Sweden disembarked at the present Old Vaasa, and the wasteland owners from Southwest Finland came to guard their land.

In the middle of the century, Saint Mary's Church was built, and in the 1370s the building of the fortress at Korsholm, Crysseborgh, was undertaken, and served as an administrative centre of the Vasa County. King Charles IX of Sweden founded the town of Mustasaari/Mussor on 2 October 1606, around the oldest harbour and trade point around the Korsholm church approximately seven kilometres (4.3 miles) to the southeast from the present city. In 1611, the town was chartered and renamed after the Royal House of Vasa.

Thanks to the sea connections, ship building and trade, especially tar trade, Vaasa flourished in the 17th century and most of the inhabitants earned their living from it.

In 1683, the three-subject or Trivial school moved from Nykarleby to Vaasa, and four years later a new schoolhouse was built in Vaasa. The first library in Finland was founded in Vaasa in 1794. In 1793, Vaasa had 2,178 inhabitants, and in the year of the catastrophic town fire of 1852 the number had risen to 3,200.

During the Finnish War, fought between Sweden and Russia in 1808–1809, Vaasa suffered more than any other city. In June 1808, Vaasa was occupied by the Russian forces, and some of the local officials pledged allegiance to the occupying force.

On 25 June 1808 the Swedish colonel Johan Bergenstråhle was sent with 1,500 troops and four cannons to free Vaasa from the 1,700 Russian troops who were led by generalmajor Nikolay Demidov. The Battle of Vaasa started with the Swedish force disembarking north of Vaasa in Österhankmo and advancing all the way to the city where they attacked with 1,100 troops, as some had to be left behind to secure the flank. There was heavy fighting in the streets and in the end the Swedish forces were repelled and forced to retreat back the way they came.

Generalmajor Demidov suspected that the inhabitants of Vaasa had taken to arms and helped the Swedish forces, even though the provincial governor had confiscated all weapons that spring, and he took revenge by letting his men plunder the city for several days. During those days 17 civilians were killed, property was looted and destroyed, many were assaulted and several people were taken to the village of Salmi in Kuortane where they had to endure the physical punishment called running the gauntlet. The massacre in Vaasa was exceptional during the Finnish war as the Russian forces had avoided that kind of cruelty that far. It was probably a result of the frustration the Russians felt because of intensive guerilla activity against them in the region.

On 30 June the Russian forces withdrew from Vaasa, and all officials that had pledged allegiance to Russia were discharged, and some were assaulted by locals. On 13 September the Russian forces returned and on the next day the decisive Battle of Oravais, which was won by Russia, was fought some 50 kilometres (30 mi) further north. By winter 1808, the Russian forces had overrun all of Finland, and in the Treaty of Fredrikshamn (17 September 1809) Sweden lost the whole eastern part of its realm. Vaasa would now become a part of the newly formed Grand Duchy of Finland within the Russian Empire.

The mainly wooden and densely built town was almost utterly destroyed in 1852. A fire started in a barn belonging to district court judge J. F. Aurén on the morning of 3 August. At noon the whole town was ablaze and the fire lasted for many hours. By evening, most of the town had burned to the ground. Out of 379 buildings only 24 privately owned buildings had survived, among them the Falander–Wasastjerna patrician house (built in 1780–1781) which now houses the Old Vaasa Museum.

The Court of Appeal (built in 1775, nowadays the Church of Korsholm), some Russian guard-houses along with a gunpowder storage and the buildings of the Vaasa provincial hospital (nowadays a psychiatric hospital) also survived the blaze. The ruins of the greystone church, the belfry, the town hall and the trivial school can still be found in their original places. Much of the archived material concerning Vaasa and its inhabitants was destroyed in the fire. According to popular belief, the fire got started when a careless visitor from Vörå fell asleep in Aurén's barn and dropped his pipe in the dry hay.

The new town of Nikolaistad (Finnish: Nikolainkaupunki), named after the late Tsar Nicholas I, rose in 1862 about seven kilometres (4.3 miles) to the northwest from the old town. The town's coastal location offered good conditions for seafaring. The town plan was planned by Carl Axel Setterberg in the Empire style. In the master plan the disastrous consequences of the fire were considered. Main streets in the new town were five broad avenues which divided the town into sections. Each block was divided by alleys.

The town was promptly renamed Vasa (Vaasa) after the Tsar Nicholas II was overthrown in 1917.

During the Finnish Civil War, Vaasa was the capital of Finland from 29 January to 3 May 1918. As a consequence of the occupation of central places and arresting of politicians in Helsinki the Senate decided to move the senators to Vaasa, where the White Guards that supported the Senate had a strong position and the contacts to the West were good.

The Senate of Finland began its work in Vaasa on 1 February 1918, and it had four members. The Senate held its sessions in the Town Hall. To express its gratitude to the town the Senate gave Vaasa the right to add the Cross of Freedom, independent Finland's oldest mark of honour designed by Akseli Gallen-Kallela, to its coat of arms, to the town's coat of arms. The coat of arms is unusual not only in this respect, but also because of its non-standard shape and a crown are included. Because of its role in the civil war, Vaasa became known as "The White City". A Statue of Freedom, depicting a victorious White soldier, was erected in the town square.

The language conditions in the city shifted in the 1930s, and the majority became Finnish-speaking. Therefore, the primary name also changed from "Vasa" to "Vaasa", according to Finnish spelling.

Post-war, Vaasa was industrialized, led by the electronics manufacturer Strömberg, later merged into ABB.

In 2013 the municipality of Vähäkyrö was merged into Vaasa. It is currently an exclave area of the city, since it is surrounded by other municipalities.

Near the Polar Circle, Vaasa falls in continental subarctic climate (Köppen: Dfc) with severe dry winters and almost warm summers. The prevailing direction of the winds, North Atlantic Current and the proximity of the Gulf of Bothnia give the climate a certainly livability in spite of the latitude, similar to the south of Alaska, where continentality, proximity to the poles and moderation intersect. The Föhn wind, for example, passes over the Scandinavian Mountains and leaves a milder and drier weather in the lee of the mountains where Vaasa is found, affecting especially in the winter which explains sunny days even in the season of short solar duration.

The location of some sea distance gives a seasonal delay of spring and summer at the same time that autumn and winter are affected late. The average annual temperature is 4.7 °C (normal from 1991 to 2020). The low Ostrobothnia usually receives little snow but the contact of cold air with warmer and humid air can generate heavy snowfall. Early summer (as well as spring) tends to be drier and the wettest month does not coincide with the warmer month. End of April is usually the growing season with 250–300 mm approximately. The maritime breeze explains the difference in temperature, distribution of precipitation and sunshine, different from the Gulf of Finland, the Gulf of Bothnia brings the sea wind in places further distant about 50 km from the coast. The city gets more sun than inland places, although current log are unavailable. The highest ever recorded temperature was 32.2 °C (89.6 °F), on 18 July 2018, although a record of 33.7 °C (92.7 °F) was recorded in the city center the same day, which in fact was the hottest day of Finland in 2018 by slightly edging a temperature recorded in Turku Artukainen of 33.6 °C (92.5 °F), also on 18 July 2018, making it the highest temperature ever recorded in Vaasa.

The city of Vaasa has 70,382 inhabitants, making it the 14th most populous municipality in Finland. The Vaasa region has a population of 111,382. In Vaasa, 12.4% of the population has a foreign background, which is above the national average.

Population size of Vaasa (and merged municipalities) 1990–2020

Year	Population
1990	58,394
1995	60,399
2000	61,470
2005	61,889
2010	64,345
2015	67,619
2020	67,551

The city of Vaasa is officially bilingual, with both Finnish and Swedish as official languages. The majority of the population - 44,621 people or 64.7% - speak Finnish as their first language. There are 16,017 Swedish speakers in Vaasa, or 23.2% of the population. 12.1% of the population of Vaasa have a mother tongue other than Finnish or Swedish. As English and Swedish - or Finnish for Swedish speakers - are compulsory school subjects, functional bilingualism or trilingualism acquired through language studies is not uncommon.

At least 50 different languages are spoken in Vaasa. The most common foreign languages are Arabic (1.1%), Russian (0.9%), English (0.9%) and Ukrainian (0.7%).

Population by country of birth (2022)
Nationality	Population	%
Finland	60,681	89.3
Sweden	784	1.2
Soviet Union	349	0.5
Vietnam	347	0.5
Iraq	336	0.5
Iran	283	0.4
Somalia	269	0.4
Thailand	236	0.3
India	226	0.3
China	226	0.3
Philippines	206	0.3
Other	4,045	5.9

As of 2023, there were 8,564 persons with a migrant background living in Vaasa, or 12.4% of the population. The number of residents who were born abroad was 8,564, or 12.4% of the population. The number of persons with foreign citizenship living in Vaasa was 5,886. Most foreign-born citizens came from the Sweden, former Soviet Union, Vietnam and Iraq.

The relative share of immigrants in Vaasa's population is above the national average. Moreover, the city's new residents are increasingly of foreign origin. This will increase the proportion of foreign residents in the coming years.

In 2023, the Evangelical Lutheran Church was the largest religious group with 65.0% of the population of Vaasa. Other religious groups accounted for 2.4% of the population. 32.6% of the population had no religious affiliation.

Vaasa is generally speaking an industrial town, with several industrial parks. Industry comprises one-fourth of jobs.

There is a university (University of Vaasa), faculties of Åbo Akademi and Hanken, and two universities of applied sciences in the town. Many workers commute from Korsholm, Laihia, and other municipalities nearby.

The Vaskiluoto power stations complex is situated on the island of Vaskiluoto, supplying electricity to the national grid as well as district heat to the city.

The multi-use cargo and passenger Port of Vaasa is located in Vaskiluoto, connecting Vaasa with Umeå, Sweden, and destinations further afield.

The film production company Future Film has its head office in Vaasa. Kotipizza has its head office in the Vaskiluodon Satamaterminaali.

Main roads, including highway 3 (E12) and highway 8 (E8), connect Vaasa to Helsinki, Tampere, Oulu, Pori, Jyväskylä, Kokkola and Seinäjoki. There are 419 kilometres (260 mi) from Helsinki to Vaasa, 330 kilometres (210 mi) from Turku, 244 kilometres (152 mi) from Tampere, 319 kilometres (198 mi) from Oulu, 121 kilometres (75 mi) from Kokkola, 99 kilometres (62 mi) from Jakobstad, 193 kilometres (120 mi) from Pori, 83 kilometres (52 mi) from Lapua and 78 kilometres (48 mi) from Seinäjoki. It is also a relatively short distance from Sweden to Vaasa. The tourist route called Blue Highway also runs from the port of Vaasa and through the city. In 1962–1964, other Finnish cities introduced regional speed limits of 50 km/h, but in Vaasa the limit was 60 km/h for a long time.

Vaasa Airport is located about nine kilometers southeast of the city center. Finnair and Scandinavian Airlines operate from Vaasa Airport, but Norwegian Air Shuttle terminated the Vaasa–Helsinki route on 10 January 2020. There is scheduled traffic from Vaasa Airport to Helsinki (flight time 45 min) and Stockholm (flight time 1 h 5 min).

• Ostrobothnian Museum
• Kuntsi Museum of Modern Art
• Vaasa Car & Motor Museum

• The Statue of Liberty (Suomen Vapaudenpatsas)
• Söderfjärden

• Vaasan Sport, men's ice hockey team playing in the Liiga, home ice is Vaasan Sähkö Areena
• Vaasan Mailattaret, a women's Finnish baseball team playing in the Superpesis, home ground is Hietalahti Pesäpallo Stadium
• Vaasan Sport Naiset, women's ice hockey team playing in the Naisten Liiga, home ice is Vaasan Sähkö Areena
• Vaasan Palloseura, men's football club playing in the Veikkausliiga, home ground is Hietalahti Stadium
• Vasa IFK, men's football club playing in the Ykkönen, home ground is Hietalahti Stadium
• FC Kiisto, men's football club playing in the Kolmonen, home ground is Hietalahti Stadium
• Vaasa Rugby Club
  • Vaasa Wolves, inactive men's rugby union team, played in the Finnish Championship Rugby League until 2019
  • Vaasa Foxes, women's rugby sevens team playing in the Finnish Championship 7's Series

Vaasa has three universities. The largest one is the University of Vaasa, which is located in the neighbourhood of Palosaari. Palosaari is a peninsula near the center of Vaasa, connected to it by bridges. The other two universities are Åbo Akademi, headquartered in Turku, and the Hanken School of Economics headquartered in Helsinki. Unique to Vaasa is the Finland-Swedish teachers training school Vasa övningsskola, part of Åbo Akademi. The University of Helsinki also has a small unit, specialized in law studies, in the city centre.

The city has two universities of applied sciences: Vaasa University of Applied Sciences (former Vaasa Polytechnic), located right next to the University of Vaasa, and Novia University of Applied Sciences (former Swedish University of Applied Sciences).

City has about 13,000 university students and about 4,000 vocational school students.

As of 2006, Vaasa has town twinning treaties or treaties of cooperation signed with the following ten cities:

City	Province	Country	Year
Malmö	Scania	Sweden	1940
Umeå	Västerbotten	Sweden	1940
Harstad	Troms	Norway	1949
Helsingør	Capital Region of Denmark	Denmark	1949
Pärnu	Pärnu County	Estonia	1956
Schwerin	Mecklenburg-Vorpommern	Germany	1965
Kiel	Schleswig-Holstein	Germany	1967
Šumperk	Olomouc Region	Czech Republic	1984
Morogoro	Morogoro Region	Tanzania	1988
Bellingham	Washington	United States	2009

^1 Godfather Town
^2 Twin Town
^3 Cooperation Treaty
^4 Sister City

• Wasa, British Columbia (named after Vasa)
• Blue Highway (an international tourist route)
• Seinäjoki (a neighboring city from the South Ostrobothnia region)
• Methodism in Finland

• Julkunen, Mikko: Vaasa - Vasa. Vaasa: Vaasa, 1982. ISBN 951-660-076-X (Photo book with English text.)

• Vaasa – Official website (in English)
• Vaasa – Official website (in Finnish)
• Vasa – Official website (in Swedish)
• Tourist's Vaasa (in Finnish, Swedish, and English)