Old Square is a public square and road junction in the Core area of Birmingham City Centre, England.
The site of the square was formerly occupied the Priory of St Thomas of Canterbury, with The Minories, Upper Priory and Lower Priory being the original entrance roads to the hospital. The land is believed to have once been the highest point in Birmingham city centre leading to the construction of the priory. In 1536, the Priory was dissolved and the structures on site were demolished in 1547.
The site remained as ruins for 150 years until it was purchased by John Pemberton in 1697. He further levelled the land for construction work to create his Priory estate.
The square dates from 1713 when it was recorded as having 16 uniform two-storied houses with five-bayed fronts having angle pilasters, pedimented doorways, and dormer windows. It was created as the centrepiece to John Pemberton's Priory Estate. It was designed by William Westley who produced a print of the square's layout in 1732. From old conveyances, it is recorded that 20s. per yard frontage was paid for the site of some of the houses in the square and up to 40s. in Bull Street; the back plots, including the Friends' burial ground (once gardens to the front houses) being valued at 1s. to 2s. per yard. One of the corner houses, originally called "the Angle House", was popular in that it was sold in 1791 for £420, increasing to £970 in 1805. In 1843 the price increased £1,330 and in 1853, £2,515.
The centre of the square itself was closed off with iron railings with several pedestrian paths. Over time it became neglected and in 1832 it was the scene of a public demonstration. The stones there were used as missiles by the crowd during the parliamentary elections of that year.
The trees and railings were removed during 1836 and 1837 as a result of many accidents occurring there due to the roadways being narrow and dangerous. Following this, the Birmingham Street Commissioners widened the roads.
The square was to suffer a major demolition programme in 1882 to make way for the construction of Corporation Street. Buildings that were constructed as a result were of grand architecture, one of which was the Grand Theatre to the south of the square. Lewis's Department store was constructed at the western end to replace Berlin House and to build over the Minories in 1885 following personal persuasion from Joseph Chamberlain.