Chelmsford is a town in the county of Essex, in the United Kingdom. It lies 30 miles northeast of London, approximately halfway between there and Colchester. It is almost exactly in the centre of the county and it is the county town of Essex, although it is neither the largest nor the oldest town in the county. It is also the seat of the borough of Chelmsford, which covers a wider area than the town.
Chelmsford is home to the Diocese of Chelmsford, and has the smallest cathedral in England. John Dee, responsible for the English translation of Euclid, was educated at the Cathedral school in the sixteenth century. Chelmsford is also home to part of the Anglia Polytechnic University and King Edward VI Grammar School.