The Eastern Counties Rugby Union (ECRU) is the governing body for the sport of rugby union in the counties of Cambridgeshire, Norfolk and Suffolk in England.

Clubs in the old Huntingdonshire and the Soke of Peterborough are affiliated to the East Midlands Rugby Football Union.

Each club is in turn affiliated with a sub-county rugby football union, either Cambridgeshire, Norfolk or Suffolk, and are mostly based in those three counties except several cases where they are instead based in Essex or Hertfordshire.

[3][4][5] The Eastern Counties RU currently helps run the following competitions for clubs from Cambridgeshire, Norfolk, Suffolk and occasionally Essex: The Eastern Counties allows 2nd and 3rd teams to play alongside 1st teams providing they are not from the same club.

Divisions include: Discontinued There is no Eastern Counties cup competition.