Picton Castle is a tall ship used for deep-ocean sail training and long distance education voyages. The ship was the subject of the television series Tall Ship Chronicles which documented her second voyage around the world in 2001. The ship has carried out seven world voyages to date - completing the seventh one in 2019. While flagged in the Cook Islands, the ship's unofficial home port is Lunenburg, Nova Scotia.

A tall ship is a large, traditionally-rigged sailing vessel. Popular modern tall ship rigs include topsail schooners, brigantines, brigs and barques. "Tall ship" can also be defined more specifically by an organization, such as for a race or festival.