商务舱是大部分交通工具旅行时座位的第二等级，此舱等在一些商业航线相当的常见。

在民用航空方面，国际航线商务舱等级比经济舱以及国内航线头等舱高，但比国际航线的头等舱低。然而，为减低成本，除了美国航空和联合航空之外的美国籍航空公司，以及其他国家航空公司如维珍航空、意大利航空、芬兰航空、新西兰航空、中华航空（仅波音747-400提供头等舱）和加拿大航空等，只提供商务舱为国际线等级最高舱等；例如****在2007年12月正式将旗下飞机上所有头等舱取消，并以质素比一般商务舱提升的「桂冠舱」取代，来期许提供有如头等舱质素的商务舱服务。维珍航空等极少数航空公司则推出全机商务舱。

Business class is a travel class available on many commercial airlines and rail lines, known by brand names which vary by airline or rail company. In the airline industry, it was originally intended as an intermediate level of service between economy class and first class, but many airlines now offer business class as the highest level of service, having eliminated first class seating. Business class is distinguished from other travel classes by the quality of seating, food, drinks, ground service and other amenities. In commercial aviation, full business class is usually denoted 'J' or 'C' with schedule flexibility, but can be many other letters depending on circumstances.