Carlow Mayo is a township in northern Hastings County in Eastern Ontario, Canada. It was formed in 2001 by the amalgamation of the townships of Carlow and Mayo. Historically, the economy in the area was based on timber and mining. The Little Mississippi River and York River were used to transport logs out of the forests. Now, tourism is an important part of the local economy. Over half of the land in the region is designated crown land.