Eastern Counties may refer to various companies, services and organizations serving the East of England:

First Eastern Counties, English bus operating company formerly known as Eastern Counties Omnibus Company, now as First Norfolk & Suffolk

Eastern Counties Football League, football league in eastern England

Eastern Counties Railway, English rail company which became part of the Great Eastern Railway in 1862

Eastern Counties Regional Library, public library system in Canada

Eastern Counties Rugby Union, a rugby union governing body and rugby team in England

Eastern Counties 1, an English level 9 Rugby Union League

Archant, newspaper publishing company in eastern England known as Eastern Counties Newspapers until 2002

National Union of Agricultural and Allied Workers, former trade union in the United Kingdom initially known as the Eastern Counties Agricultural Labourers & Small Holders Union