By or BY may refer to:
The Byzantine Empire, also referred to as the Eastern Roman Empire or Byzantium, was the continuation of the Roman Empire in its eastern provinces during Late Antiquity and the Middle Ages, when its capital city was Constantinople (modern-day Istanbul, and formerly Byzantium).
The Byelorussian Soviet Socialist Republic (BSSR, or Byelorussian SSR; Belarusian: Беларуская Савецкая Сацыялістычная Рэспубліка, translit.
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.
Byblos, known locally as Jbeil (Arabic: جبيل), is the largest city in the Mount Lebanon Governorate of Lebanon.
The Byzantine Rite, also known as the Greek Rite or Constantinopolitan Rite, is the liturgical rite used by the Eastern Orthodox Church, the Greek/Byzantine Catholic churches, and in a modified form, Byzantine Rite Lutheranism.
Bydgoszcz (Polish: [ˈbɨdɡɔʂt͡ʂ] (listen); German: Bromberg [ˈbʁɔmbɛɐ̯k]; Latin: Bydgostia) is a city in northern Poland, on the Brda and Vistula rivers.
Bye Bye Birdie is a stage musical with a book by Michael Stewart, lyrics by Lee Adams and music by Charles Strouse.
John Byron Nelson Jr. (February 4, 1912 – September 26, 2006) was an American professional golfer between 1935 and 1946, widely considered one of the greatest golfers of both his generation and of all time.
ByteDance (Chinese: 字节跳动; pinyin: Zìjié Tiàodòng) or Beijing ByteDance Technology Co Ltd. is a Chinese Internet technology company operating several machine learning-enabled content platforms, headquartered in Beijing.