The Seth Hallett House is a historic house in the Hyannis village of Barnstable, Massachusetts. Built in 1775, this 1+1⁄2-story Cape house is one of the few surviving Federal style houses on Main Street in Hyannis. In the mid-19th century it was occupied by Seth Hallett, a town selectman. The house was listed on the National Register of Historic Places in 1987.