Perth and Kinross Council won the Waste Minimisation Award for its efforts to minimise business waste.
Westray Development Trust won the Community Waste Initiative Award for its success in generating renewable energy from waste cooking oil.
Martin King won the Individual Achievement Award for his ongoing contribution to waste management in Scotland.
Ogilvie Ross won the Award for Environmental Innovation for its success in reducing the amount of waste going to landfill from office refurbishments.
Eventful Scotland awards coordinator Amanda Ingram said: "This year's winners demonstrate the diversity of work being undertaken by the waste management sector. I hope that others working within the industry will look to these organisations and individuals as examples of how we can all work to improve the way we manage waste in Scotland."