The National Forest Wood Fair attracts over 5,000 visitors every August Bank Holiday Monday at Beacon Hill Country Park.
This will be the fourth year Vitax has supported The National Forest, working in partnership with the company for the past three years to help create three hectares of woodland at Normanton le Heath by planting 6,000 trees.
Vitax chairman Paul Gooding said: "Vitax already has strong links with The National Forest and we wanted to extend that support by sponsoring the Wood Fair.
"The event raises awareness not just about the need to protect and cherish the environment but increases visibility of how wood is used and can be used.
"Over the next few months we will be working together to promote the event, especially amongst our suppliers and customers. It is already hugely successful and we want to help spread the message of the good work The National Forest does whilst having fun along the way."
National Forest Company fundraising head Lynne Richards said: "Our partnership with Vitax helps our work significantly and this event will be a great opportunity to promote the importance of wood and the environmental and educational aspects of the work we do with visitors.
"The National Forest Wood Fair is proud to continue into its tenth year and we are thrilled that Vitax have chosen to continue its journey with us."