Penn v Lord Baltimore (1750) 1 Ves Sen 444 was a judicial decision of Lord Hardwicke LC in relation to the long-running Penn–Calvert boundary dispute. The case is important both as a legal precedent under English law (in relation to the extent to which the English courts may act in relation to matters involving title to foreign land), but also as an event in its own right during a formative period of the pre-history of the United States.