The Peterborough Lakers are Senior "A" box lacrosse team from Peterborough, Ontario. They play in the Major Series Lacrosse league where under the current format, they compete in 16 regular season games from May through July and playoffs beginning in August and ending with the Mann Cup in September. The Lakers play their home games at the 4,329-seat multipurpose Peterborough Memorial Centre.

Peterborough has won the Ontario Championship 26 times in total (1951 to 1957, 1959, 1966, 1970, 1973, 1978, 1979, 1982 to 1984, 2004 to 2007, 2010, 2012, 2015, and 2017 to 2019, 2022) and the Mann Cup 18 times in total (1951 to 1954, 1966, 1973, 1978, 1982, 1984, 2004, 2006, 2007, 2010, 2012, 2017 to 2019, 2022), of which only 13 were while the team was using the name Lakers.^[1] As the Lakers, they won the Mann Cup in: 2022, 2019, 2018, 2017, 2012, 2010, 2007, 2004, 1984, 1982, 1973, and 1966.

In the early 2000s, the Lakers' biggest rival were the Brampton Excelsiors. They met in the MSL Finals every year Between the 2003 and 2011 seasons,^[2] often finishing 1st and 2nd overall in the regular season. Meeting each other so often in the playoffs, compounded by many of the players playing on rival teams in the National Lacrosse League, which created many intensely contested matches between the two teams. Despite players coming and going between the two franchises, the rivalry has lived on, if not on the floor, then most certainly in the stands.

A rivalry also exists with the Six Nations Chiefs, particularly after the 2011 emotional MSL semi-finals where tempers flared amongst fans and players alike, and meeting in the MSL Finals in 2012, and 2014 through to 2017.

In 2008, the Peterborough City Council agreed to a 10-year $120,000 interest-free loan to finance the purchase and installation of a carpet for use by the Lakers in the Memorial Centre .^[9] The carpet was initially met with some resistance from some on council, however the plan was approved. Councillors argued it would increase usage of the Peterborough Memorial Centre during the Summer, increase player safety and would allow co-existence of the Lakers and the Peterborough Petes of the Ontario Hockey League .^[10][11] To finance the carpet, sponsors are able to purchase advertising on the carpet during Lakers home games.^[12]

• Peterborough Lakers Jr. A
• Pat Baker (lacrosse)
• Lloyd Wootton