Winning the large campaigns category, as well as the overall first place, the campaign led by Nottinghamshire County Council, scooped a total of £600 in prize money.
The awards, sponsored by the Waste and Resources Action Programme (WRAP), were established to recognise, reward and publicise the best local activities that contributed to Real Nappy Week.
Nottinghamshire County Council cabinet member for environment and sustainability Stella Smedley said: "We are absolutely delighted to have been chosen as the overall winner.
The award will allow us to build on our Nottinghamshire-wide real nappy awareness raising work."
Chosen for its innovative approach to bringing real nappies into the mainstream, the Notts campaign included a fashion show, a sale day, work with BBC Radio Nottingham and a competition in the local press.
Comhairle Nan Eilean Siar won the small campaigns category and The Bucks Real Nappy Initiative and Wiltshire Real Nappy Network were runners up in the large campaigns category.