The textbook "Waste Materials and By-Products in Concrete" offers a comprehensive analysis of the use of non-hazardous waste materials and by-products in concrete production. It highlights the opportunities that arise from utilizing materials that often end up in landfills. Each chapter focuses on a specific material and discusses its chemical and physical properties, as well as its potential for use in the construction industry. Additionally, the influence of these materials on the various properties of concrete is examined, which is of great interest to professionals in construction and materials science. The materials covered include, among others, granulated blast furnace slag, metakaolin, recycled plastics, used tires, waste glass, and many more that can contribute to improving sustainability in the construction sector.