Grand Union may refer to:
Transport
Grand union, a four-way, double track rail junction often found on tram systems
Grand Union Canal, a canal running from London to Birmingham in England
Grand Union Canal (old), a former canal in England, now forms a branch of the bigger Grand Union Canal
Grand Central (train operating company), a train operating company in England that at one stage proposed trading as Grand Union Railway
Grand Union (train operating company), a prospective train operating company
Entertainment
Grand Union Orchestra, a London world jazz ensemble
Grand Union (dance group), a former New York dance group
Grand Union (Firebird album), 2009
Grand Union (Frank Tovey album), 1991
Other uses
Grand Union flag, the first national flag of the United States
Grand Union of 1256
Grand Union (supermarket), an American supermarket chain
Grand Union (short story collection), a 2019 short story collection by Zadie Smith