The Battle of George Square takes place in Glasgow, Scotland, during a campaign for shorter working hours.

The Battle of George Square was a violent confrontation in Glasgow, Scotland between City of Glasgow Police and striking workers, centred around George Square. The "battle", also known as "Bloody Friday" or "Black Friday", took place on Friday 31 January 1919, shortly after the end of the First World War. During the riot, the Sheriff of Lanarkshire called for military aid, and government troops, supported by six tanks, were moved to key points in the city, though troops never clashed with the rioters. The strike leaders were arrested for inciting the riot. Although it is often stated that there were no fatalities, one police constable died several months later from injuries received during the rioting.

Glasgow is the most populous city in Scotland, located on the banks of the River Clyde in west central Scotland. It is the third-most-populous city in the United Kingdom and the 27th-most-populous city in Europe, and comprises 23 wards which represent the areas of the city within Glasgow City Council. Glasgow is a leading city in Scotland for finance, shopping, industry, culture and fashion, and was commonly referred to as the "second city of the British Empire" for much of the Victorian and Edwardian eras.