By or BY may refer to:
The Byzantine Empire, also referred to as the Eastern Roman Empire or Byzantium, is the common name given to the surviving 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, romanized: Biełaruskaja Savieckaja Sacyjalistyčnaja Respublika; Russian: Белорусская Советская Социалистическая Республика, romanized: Belorusskaya Sovetskaya Sotsialisticheskaya Respublika or Russian: Белорусская ССР, romanized: Belorusskaya SSR), also commonly referred to in English as Byelorussia, was a federal unit of the Soviet Union (USSR).
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.
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.
Bydgoszcz (Polish: [ˈbɨdɡɔʂt͡ʂ] (listen); German: Bromberg [ˈbʁɔmbɛɐ̯k]; Latin: Bydgostia) is a city in northern Poland, on the Brda and Vistula rivers.
Byun Baek-hyun (born May 6, 1992), better known mononymously as Baekhyun, is a South Korean singer, songwriter, actor, and model.
The Byzantine–Sasanian War of 602–628 was the final and most devastating of the series of wars fought between the Byzantine Empire and the Sasanian Empire of Iran.