This chapter presents a comprehensive study on the mechanical property evaluation of coating materials, focusing on critical aspects such as adhesion, hardness, and elastic modulus. The significance of coatings in enhancing the performance and durability of materials in various industrial applications is emphasised. A detailed analysis of the different testing methodologies, including scratch, indentation, and nanoindentation tests, is provided to assess the mechanical properties of coatings. The chapter also explores the influence of factors such as coating thickness, substrate material, and deposition techniques on the mechanical behaviour of coatings. Experimental results are discussed to illustrate the effectiveness of these evaluation techniques, offering valuable insights for developing and optimising advanced coatings with improved mechanical properties.