Хэфэй: столица провинции Аньхой и научный центр Китая.

Hefei (/h//ə/'/f//eɪ/; ) is the capital and largest city of Anhui Province, People's Republic of China. A prefecture level city, it is the political, economic, and cultural center of Anhui. Its population was 9,369,881 as of the 2020 census. Its built up (or metro) area is made up of four urban districts plus Feidong, Feixi and Changfeng counties being urbanized, was home to 7,754,481 inhabitants. Located in the central portion of the province, it borders Huainan to the north, Chuzhou to the northeast, Wuhu to the southeast, Tongling to the south, Anqing to the southwest and Lu'an to the west. A natural hub of communications, Hefei is situated to the north of Chao Lake and stands on a low saddle crossing the northeastern extension of the Dabie Mountains, which forms the divide between the Huai and Yangtze rivers. The present day city dates from the Song dynasty. Before World War II, Hefei remained essentially an administrative centre and the regional market for the fertile plain to the south. It has gone through a growth in infrastructure in recent years. Hefei is the location of Experimental Advanced Superconducting Tokamak, an experimental superconducting tokamak magnetic fusion energy reactor. Hefei is a world leading city for scientific research, with its ranking placed at 13th globally, 8th in the Asia Pacific and 6th in China (behind Beijing, Shanghai, Nanjing, Guangzhou and Wuhan), as tracked by the Nature Index in 2023. The city is represented by several major universities, including the University of Science and Technology of China, Hefei University of Technology, Anhui University, Anhui Agricultural University and Anhui Medical University. Notably, the University of Science and Technology of China is one of the top 100 comprehensive public research universities in the world.

From the 8th to the 6th centuries BC, Hefei was the site of many small states, later a part of the Chu kingdom. Many archaeological finds dating from this period have been made. The name 'Hefei' was first given to the county set up in the area under the Han dynasty in the 2nd century BC. In the 3rd century AD, the Battle of Xiaoyao Ford was fought at Xiaoyao Ford (逍遙津) in Hefei. Zhang Liao, a general of the Wei state, led 800 picked cavalry to defeat the 200,000 strong army from Wei's rival state Wu. Several decades of warring in Hefei between Wu and Wei followed this battle. During the 4th to the 6th centuries AD, this crucial border region between northern and southern states was much fought over; its name and administrative status were consequently often changed. During the Sui (581–618) and Tang (618–907) periods, it became the seat of Lu prefecture—a title it kept until the 15th century, when it became a superior prefecture named Luzhou. The present city dates from the Song dynasty (960–1126), the earlier Hefei having been some distance farther north. In the 10th year of Xining (, 1077 AD), the taxes collected from the Luchow Prefecture were 50315 Guan, approximately 25 million today's Chinese Yuan, with a ranking of the amount of taxes was the 11th(following Kaifeng, Hangzhou, Qinzhou, Chuzhou, Chengdu, Zizhou, Xingyuan, Mianzhou, Zhenzhou, Suzhou) among all the prefectures of Song Dynasty. During the 10th century, it was for a while the capital of the independent Wu kingdom (902–938) and was an important center of the Southern Tang state (937–975). After 1127 it became a center of the defenses of the Southern Song dynasty (1126–1279) against the Jin (Jurchen) invaders in the Jin–Song wars, as well as a flourishing center of trade between the two states. When the Chinese Republic was founded in 1911, the superior prefecture was abolished, and the city took the name of Hefei. The city was known as Luchow or Liu tcheou (, p Luzhou) during the Ming and Qing dynasties (after the 14th century to the 19th century). Hefei was the temporary capital for Anhui from 1853 to 1862. It was renamed as Hefei County in 1912. Following the Chinese victory in the Second Sino Japanese War in 1945, Hefei was made the capital of Anhui. Before World War II, Hefei remained essentially an administrative center and the regional market for the fertile plain to the south. It was a collecting center for grain, beans, cotton, and hemp, as well as a center for handicraft industries manufacturing cloth, leather, bamboo goods, and ironware. The construction in 1912 of the Tianjin–Pukou railway, farther east, for a while made Hefei a provincial backwater, and much of its importance passed to Bengbu. In 1932–36, however, a Chinese company built a railway linking Hefei with Yuxikou (on the Yangtze opposite Wuhu) to the southeast and with the Huai River at Huainan to the north. While this railway was built primarily to exploit the rich coalfield in northern Anhui, it also did much to revive the economy of the Hefei area by taking much of its produce to Wuhu and Nanjing. Although Hefei was a quiet market town of only about 30,000 in the mid 1930s, its population grew more than tenfold in the following 20 years. The city's administrative role was strengthened by the transfer of the provincial government from Anqing in 1945, but much of its new growth derived from its development as an industrial city. Hefei was designated the provincial capital in 1952. A cotton mill was opened in 1958, and a thermal generating plant, using coal from Huainan, was established in the early 1950s. It also became the seat of an industry producing industrial chemicals and chemical fertilizers. In the late 1950s an iron and steel complex was built. In addition to a machine tool works and engineering and agricultural machinery factories, the city has developed an aluminum industry and a variety of light industries. Hefei's development was advanced by the Third Front construction. In 1970, the University of Science and Technology of China relocated to Hefei. the situation is improving due to efforts by both the government and the people.

Hefei features a humid subtropical climate (Köppen Cfa) with four distinct seasons. Hefei's annual average temperature is Its annual precipitation is just slightly over , being heavier from May through August. Winters are damp and cold, with January lows dipping just below freezing and January averaging The city sees irregular snowfalls that rarely turn significant. Occasional cold spells from Siberia that usually happen during winter months such as December, January, February. Sometimes November and March which can bring snow and heavier snowfall. (Springs are generally relatively pleasant if somewhat erratic. Summers are hot and humid, with a July average of In the months of June, July, August, and often September, daily temperatures can reach or surpass with high humidity levels being the norm. Autumn in Hefei sees a gradual cooling and drying. With monthly percent possible sunshine ranging from 35 percent in March to 50 percent in August, the city receives 1,868 hours of bright sunshine annually. Extremes since 1951 have ranged from on 6 January 1955, to on 27 July 2017.

Air quality typically diminishes in May and June when the city is blanketed by smog caused by the smoke generated as farmers outside the city burn their fields in preparation for planting the next crop.

The majority of the population in Hefei are Han Chinese. There are a comparatively small number of Hui Chinese living in the city, for whom a few mosques have been constructed. Of the more than five million people in the city, some are migrant workers from other parts of Anhui.

As of 2021, the GDP of Hefei is CN¥1,141.28 billion. The GDP per capita of the city is ¥121,187 (US$18,784), ranking within the top 20 of cities in China. As of 2023, the GDP of Hefei is CN¥1,267.38 billion.

Hefei's city government is highly engaged in business, both through state owned enterprises and investment. NIO moved its headquarters to Hefei, where the government helped it obtain loans from local banks to expand its supply chains. Hefei was identified by The Economist in December 2012 as the world's No.1 fastest growing metropolitan economy.

Hefei has been the provincial capital since 1945 (before it was Lihuang, which is today's Jinzhai) and is a natural center of transportation, being situated to the north of Chao Lake and standing on a low saddle crossing the northeastern extension of the Dabie Mountains, which form the divide between the Huai and Yangtze rivers. From Hefei there is easy water transport via the lake to the Yangtze River opposite Wuhu.

There are two main train stations in Hefei. The newest one is Hefei South railway station (Hefeinan station, 合肥火车南站) where most high speed trains pass through. The alternative station is Hefei railway station (合肥火车站) which is smaller and older. There are some small stations such as Feidong Station (肥东火车站), Feixi Station (肥西火车站), Shuijiahu Station (水家湖火车站), Chaohu Station (巢湖火车站), Chaohu East railway station (Chaohudong station; 巢湖火车东站), Hefeibeicheng Station (Hefei Northtown Station 合肥北城火车站), Lujiang Station (庐江火车站) and so on. These stations are mostly located in small towns and connect commuters with the main city.

Hefei Xinqiao International Airport replaced the old Hefei Luogang International Airport and started its operation on 30 May 2013, 00:00. This new domestic aviation hub is located in Gaoliu Village situated in the northwestern part of Hefei City. The first arriving flight was China Eastern Airlines flight MU5172 from Beijing Capital International Airport. The first departing flight was China Eastern Airlines MU5468 to Shanghai Pudong International Airport. Hefei Xinqiao International Airport provides scheduled passenger service to major airports in China and other international cities. Destinations include Hong Kong, Macao, Singapore, Taipei (Taoyuan, Songshan), Kaohsiung, Taichung, Seoul, Cheongju, Yangyang, Jeju, Osaka, Nagoya, Shizuoka, Okayama, Boracay Island, Bali Island, Frankfurt, Siem Reap, Bangkok, Phuket Island and Krabi Island.

Hefei Metro is a rapid transit rail network under construction that will eventually serve both urban and rural areas of Hefei. As planned, Line 1 covers a total distance of starting from Hefei Railway Station. It was inaugurated in December 2016. In February 2013, Metro Line 2 also began its construction. It is being built alongside the Changjiang Dong Road, Changjiang Zhong Road and Changjiang Xi Road, which is a major passenger corridor in the east–west direction. It will pass through the city center area and connect to a transit point where passengers will be able to take the shuttle bus to Hefei Xinqiao International Airport. The Line 2 was opened on 26 December 2017. In November 2015, Metro Line 3 construction began. Line 3 was opened on 26 December 2019. Line 3 connects the New Station Exploitative experimental Zone and the Economic Technology Development District, from the vocational education town to the university town. In 2016, Metro Line 4 construction began. Line 4 was opened on 26 December 2021. Line 4 connects the New Station Exploitative experimental Zone and the High Technology Development District. In 2017, Metro Line 5 construction began. The south part of Line 5 was opened on 26 December 2020. Line 5 connects Binhu New District and the Beicheng (North city) New District. The north part of Line 5 is expected to open at the end of 2022. Alongside Line 1, Line 2, Line 3, Line 4 and Line 5, Hefei is also planning to build other 12 metro lines, 4 lines of intra metropolitan rail transit (to Lu'an, Huainan, Lujiang and Chaohu) and 3 lines of tram and hopefully accomplish the project by 2030.

There is an extensive public bus system in the city, including eight bus rapid transit lines. There are several commuter lines which only run at designated time or having a large interval.

Hefei plays an important role in scientific research in China. It has seven national laboratories, second only to Beijing: The National Synchrotron Radiation Laboratory , the Hefei National Laboratory for Physical Sciences at the Microscale , both of which are under the University of Science and Technology of China. It also has the Institute of Solid State Physics, Institute of Plasma Physics, Institute of Intelligent Machines, High Magnetic Field Laboratory (founded in 2008), Anhui Institute of Optics and Fine Mechanics, all of which are under the Hefei Institutes of Physical Science which belongs to the Chinese Academy of Sciences. Hefei is the location of Experimental Advanced Superconducting Tokamak, an experimental superconducting tokamak magnetic fusion energy reactor. The No. 105 Hospital of the People's Liberation Army, located in Hefei, is reportedly the site of the first human trials using CRISPR genome editing, doing so in 2015. As of 2017, Hefei had 60 universities and more than 564 research institutes.

Hefei had its own football team called Anhui Jiufang, who in the 2007–08 season were promoted from the Chinese Football Association Yi League to the Chinese Football Association Jia League which is the second highest tier of Chinese football. It was acquired by Tianjin Runyulong in 2011.