酒吧（Bar，Pub，Tavern）是指提供啤酒、葡萄酒、洋酒、鸡尾酒等酒精类饮料的消费场所。Bar多指娱乐休闲类的酒吧，提供现场的乐队或歌手、舞女表演。高级的Bar还有调酒师表演精彩的花式调酒。而Pub和tavern多指英式的以酒为主的酒吧。酒吧有很多类型和风格，既有最低档的“潜水吧”，也有为社会精英人士提供娱乐的优雅场所。酒吧最初源于美国西部大开发时期的美洲大陆，bar一词到16世纪才有“卖饮料的柜台”这个义项，后又经美洲进一步的变异、拓展，约20世纪80至90年代传入华人地区及华洋杂处的社会。

A bar (also known as a saloon or a tavern or sometimes a pub or club, referring to the actual establishment, as in pub bar or club bar etc.) is a retail business establishment that serves alcoholic beverages, such as beer, wine, liquor, cocktails, and other beverages such as mineral water and soft drinks and often sell snack foods such as crisps or peanuts, for consumption on premises. Some types of bars, such as pubs, may also serve food from a restaurant menu.