St Peter's Square is a public square in Manchester city centre, England. The north of the square is bounded by Princess Street and the south by Peter Street. To the west of the square is Manchester Central Library, Midland Hotel and Manchester Town Hall Extension. The square is home to the Manchester Cenotaph and the St Peter's Square Metrolink tram stop and incorporates the Peace Garden. In 1819, the area around the square was the site of the Peterloo Massacre.
The square is currently undergoing a controversial redevelopment project which includes the construction of a high rise office block, One St Peter's Square, to the south of the square. Two further high-rise office blocks are proposed opposite the Town Hall Extension (Two St Peter's Square) and on the former Odeon Cinema site.