The Peterborough Museum & Archives, formerly the Peterborough Centennial Museum and Archives (PCMA), is a historical museum located within the city of Peterborough, Ontario, Canada. Found only a short distance from the Trent-Severn Waterway National Historic Site of the Peterborough Lift Lock, the museum has a history spanning well over a century and is home to the second oldest historical collection of its kind within Ontario. Thousands of linear feet of archival materials and over 33,000 artifacts are included in the collection of which only 3% is displayed at any one time due to space restrictions.