3 St Peter's Square is a high-rise hotel and aparthotel in Manchester city centre, England.

Designed by Stephenson Studio with Leach Rhodes Walker as the delivery architect, the building comprises a 256 unit aparthotel operated by Staycity and a hotel containing 328 rooms operated by Motel One.

[4] The site of 3 St Peter's Square was previously occupied by Peterloo House, an eight-storey 1970s office block that was demolished in 2018.

[5][6] The developer, Property Alliance Group, had originally earmarked the site for new office space, but appraisals identified the potential for a hotel to be constructed instead.

[1] The building is finished in a decorative pre-cast concrete façade, similar in tone to the neighbouring One St Peter's Square and Two St Peter's Square office buildings and designed to be sympathetic to its location, close to the landmarks of Manchester Town Hall and Central Library.