The Mimico Mountaineers or Mimico Lacrosse Club is a Jr. A box lacrosse association in Toronto, Ontario, Canada. The Mountaineers operate junior-age and younger teams. Their home arena is Mimico Arena in the Mimico neighbourhood of Toronto. Beginning in 2015, their primary junior team will be a member of the Ontario Junior A Lacrosse League. From 1993 until 2014, the Mountaineers were members of the Ontario Junior B Lacrosse League.