Hy-Line Cruises (colloquially referred to as Hy-Line, and legally Hyannis Harbor Tours Inc.) is a family owned and operated Massachusetts ferry and cruise company. The company currently operates the second largest passenger ferry service between mainland Cape Cod and the islands of Martha's Vineyard and Nantucket (after the Steamship Authority). The company also operates sightseeing cruises and fishing charters. The company's main office is located at 22 Channel Point Road in Hyannis.