Glasgow, (, also UK: /ˈɡlɑːzɡoʊ, ˈɡlɑːsɡoʊ/, ; Scots: Glesca or Glesga [ˈɡlezɡə]; Scottish Gaelic: Glaschu [ˈkl̪ˠas̪əxu]) with an estimated city population of 633,120 in 2019, is the most populous city in Scotland, the fourth most populous city in the United Kingdom (as of 2011), as well as the 27th largest city by population in Europe. Historically part of Lanarkshire, the city now forms the Glasgow City council area, one of the 32 council areas of Scotland; the local authority is Glasgow City Council. Glasgow is situated on the River Clyde in the country’s West Central Lowlands. It is the fifth most visited city in the UK.

Glasgow grew from a small rural settlement on the River Clyde to become the largest seaport in Scotland, and tenth largest by tonnage in Britain. Expanding from the medieval bishopric and royal burgh, and the later establishment of the University of Glasgow in the 15th century, it became a major centre of the Scottish Enlightenment in the 18th century. From the 18th century onwards, the city also grew as one of Great Britain’s main hubs of transatlantic trade with North America and the West Indies. With the onset of the Industrial Revolution, the population and economy of Glasgow and the surrounding region expanded rapidly to become one of the world’s pre-eminent centres of chemicals, textiles and engineering; most notably in the shipbuilding and marine engineering industry, which produced many innovative and famous vessels. Glasgow was the “Second City of the British Empire” for much of the Victorian era and Edwardian period, having taken the mantle from pre-independence Dublin, which was largely recognised the second city during the Georgian era although many other cities argue the title was theirs, not Glasgow’s.

In the late 19th and early 20th centuries, Glasgow’s population grew rapidly, reaching a peak of 1,127,825 people in 1938. Comprehensive urban renewal projects in the 1960s resulted in large-scale relocation of people to designated new towns, such as Cumbernauld, Livingston, East Kilbride and peripheral suburbs, followed by successive boundary changes. This process reduced the population of the City of Glasgow council area to an estimated 626,410 in 2019, with 985,290 people living in the defined Greater Glasgow contiguous urban area as of 2016. The wider metropolitan area is home to over 1,800,000 people, equating to around 33% of Scotland’s population. The city has one of the highest densities of any locality in Scotland at 4,023/km².

Glasgow hosted the 2014 Commonwealth Games and the first European Championships in 2018; and is also well known in the sporting world for football (particularly the Old Firm rivalry between Celtic and Rangers), rugby, athletics, tennis, golf and swimming. Today, Glasgow has a diverse architectural scene, one of the key factors leading visitors to the city. From the city centre sprawling with grand Victorian buildings, to the many glass and metal edifices in the International Financial Services District to the serpentine terraces of blonde and red sandstone in the fashionable west end and the imposing mansions which make up Pollokshields, on the south side. The banks of the River Clyde are also dotted with a plethora of futuristic-looking buildings which include Riverside Museum, Glasgow Science Centre, the SSE Hydro and the SEC Armadillo.