This work is related to the preliminary lab-scale preparation of ceramic slabs, reproducing the characteristics of natural stones, containing up to more than 40 wt.% of different waste materials, namely laboratory glass, cullet glass (both thought as fluxing agents replacing feldspar), and ceramic waste obtained from drying squaring operations (for partial quartz sand replacement). Indeed, in order to pursue the circular economy principles, the possibility of turning different kinds of wastes into resources for the ceramic industry, surely represents the first concern to be addressed and demonstrated, with also the aim to reduce the environmental impact associated with landfill, minimizing manufacturing cost and contributing to preserve nonrenewable natural resources, which are known to be consistently depleted by the ceramic industries. K E Y W O R D S ceramic slab, circular economy, physical-chemical characterization, recycling, thermal characterization, waste materials How to cite this article: Mugoni C, Rosa R, Remigio VA, Ferrari AM, Siligardi C. Opportune inward waste materials toward a zero waste ceramic slabs production in a circular economy perspective.