The CapeFlyer (stylized CapeFLYER) is a passenger rail service in Massachusetts between Boston and Cape Cod that began in 2013. It is operated by the Cape Cod Regional Transit Authority (CCRTA) in collaboration with the Massachusetts Bay Transportation Authority (MBTA) and the Massachusetts Department of Transportation (MassDOT). The service runs on the weekends, beginning Friday evenings and including holidays, between Memorial Day weekend and Labor Day weekend.

During 2013, its first season, the CapeFLYER carried a total of 16,586 passengers, with service extended from Labor Day to Columbus Day weekend due to its early success. In October 2013, MassDOT announced the service would return in 2014 and in subsequent years, and would add a stop in Wareham, Massachusetts beginning in 2014. Year-round weekend service over the route and full MBTA Commuter Rail service as far as Buzzards Bay are under consideration.

It is the first scheduled passenger train to Cape Cod since Amtrak's Cape Codder ceased operation in 1996, and the first direct service between South Station in Boston and Cape Cod since 1961. The Cape Cod & Hyannis Railroad operated scheduled service between Braintree station, south of Boston (the southern terminus of the MBTA's Red Line), and the Cape from 1984 until 1988, but did not extend that service to Boston proper.

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