By or BY may refer to:
The Byzantine Empire, also referred to as the Eastern Roman Empire, was the continuation of the Roman Empire in the East during Late Antiquity and the Middle Ages, when its capital city was Constantinople (modern-day Istanbul, which had been founded as Byzantium).
Bydgoszcz (Polish pronunciation: [ˈbɨdɡɔʂt͡ʂ], German: Bromberg [ˈbʁɔmbɛɐ̯k], Latin: Bydgostia) is a city in northern Poland, on the Brda and Vistula rivers.
The bystander effect, or bystander apathy, is a social psychological phenomenon in which individuals are less likely to offer help to a victim when other people are present.
Bye Bye Birdie is a stage musical with a book by Michael Stewart, lyrics by Lee Adams and music by Charles Strouse.
The Byzantine–Sasanian War of 602–628 was the final and most devastating of the series of wars fought between the Byzantine (Eastern Roman) Empire and the Sasanian Empire of Persia.
Byun Baek-hyun (born May 6, 1992), better known mononym as Baekhyun, is a South Korean singer and actor.
The Byzantine Greeks (or Byzantines) were a medieval Greek-speaking Orthodox Christian people. They were the main inhabitants of the lands of the Byzantine Empire (Eastern Roman Empire), of Constantinople and Asia Minor (modern Turkey), the Greek islands, Cyprus, and portions of the southern Balkans, and formed large minorities, or pluralities, in the coastal urban centres of the Levant and northern Egypt.
Byron Anton Scott (born March 28, 1961) is an American professional basketball former head coach and player.