Duxbury Beach is a beach in the town of Duxbury, Massachusetts. It is six miles long and is accessed by the Powder Point Bridge from Duxbury, or Gurnet Road from Marshfield. Approximately 4.5 miles of the beach is owned by Duxbury Beach Reservation, Inc, which leases a portion of the beach out to the town of Duxbury on a yearly basis, under the circumstances that the town of Duxbury provides Harbormasters to police the area.