Bay State may refer to: Massachusetts, nicknamed the "Bay State", a U.S. state with shores on Massachusetts Bay, Cape Cod Bay, Buzzards Bay and Narragansett Bay Bay State College, a defunct private university in Boston, Massachusetts Bay State Conference, a high school athletic conference in Massachusetts Bay State (TV series), the Boston University-produced soap opera Bay State Road, a street on the Boston University campus Bay State (musical instrument brand), a brand of musical instrument made in the 19th century by John C. Haynes & Co.