Alypia langtoni, the six-spotted forester or Langton's forester, is a moth of the family Noctuidae. The species was first described by William Couper in 1865. It is found in North America from Newfoundland to Alaska, south to Maine and Wisconsin in the east, south in the west to Colorado and California. The wingspan is about 30 mm. Adults are on wing from May to July in one generation depending on the location. The larvae feed on Epilobium species.