The Horwich Coat of Arms was granted to the Horwich Town Council as a Successor Parish Council by the Earl Marshal on 6th December 1974, signed by the Kings of Arms of the College Arms on 1st September 1975, and presented to the Town Council in March 1976. It replaced the unregistered Coat of Arms which had been used for many years by the former Horwich Urban District Council.

It features a deer and huntsman - reminders of Horwich as a Royal hunting forest in the middle ages, two red Lancashire roses separated by a pair of black railway lines depicting the railway industry of Horwich and the Cross of the Pilkington family. Bishop Pilkington was a founder of the nearby Rivington Grammar School.

The motto "Copia est Labor" roughly translates to "Industry brings Prosperity".

The actual heraldic description of the Coat of Arms on the Grant of Arms reads: "Vert a Hart courant proper gorged with an Ancient Crown on a Chief Or between four Pallets two and two Sable all between two Roses Gules barbed and seeded proper and for the Crest on the Wreath Argent and Gules a huntsman habited and drawing his bow all proper".