Old Market Square may refer to:
- Old Market square, Bydgoszcz, oblong place in old town district of Bydgoszcz, Poland
- Old Market Square (Lviv), 12th-century town center in Lviv, Ukraine
- Old Market Square, open, pedestrianised city square in Nottingham, England
- Old Market Square tram stop, stop of Nottingham Express Transit (NET) in centre of Nottingham
- Old Market Square, Potsdam, centrally located square in downtown Potsdam, Germany
- Old Market Square, Poznań, centermost neighborhood in Poznań, Poland
- Old Market Square, Winnipeg, cultural area and former market square in Manitoba, Canada.