This work studied the recycling of fish bone ash by using it in stoneware tiles. Tiles containing up to 20 mass-% crushed and fired fish bone were prepared from starting materials characterized with respect to their chemical composition and X-ray diffraction and thermal properties. The effects of added fish bone ash were studied by measuring the physical, mechanical and thermal properties of sintered tile bodies. Results revealed that replacement of potash feldspar by fish bone ash in the tiles accelerated formation of anorthite phase and hindered the creation of mullite. The tested samples also had lower thermal expansion than conventional tiles, and displayed increased porosity and decreased bulk density as their fish bone ash content increased.