The sculptures, dubbed Colour Crops, has been created by local artists who worked with children from Worsbrough Common Primary School.
It includes six brightly-coloured carved poles that stand two metres tall, and can be seen close to the main courtyard of the site.
Coun Robert Frost, cabinet spokesperson for regeneration and culture, said: “Worsbrough Mill’s history is fascinating.
“A producer of flour using traditional methods for hundreds of years, it was important for us celebrate this important industry and the skills that still live on through the Millers and bakers.
“This community led project has inspired local children to think about the importance of the Mill in terms of food production and how wheat is a crucial part of that process.
“The artwork is stunning and a real asset to the country park which continues to flourish, becoming an ever more special place to visit.”