The development of functionalized thin film coatings containing organic and inorganic additives is crucial for enhancing corrosion protection and performance in various industries. This book chapter explores the influence of organic and inorganic additives on the mechanical and electrochemical properties of coatings, as well as the synergistic effects achieved by combining these additives. We discuss the importance of understanding the influence of additives to tailor coatings for specific applications and optimize performance. The chapter also highlights the potential for further advancements in functionalized thin film coatings for corrosion protection by incorporating novel materials, advanced manufacturing techniques, and emerging technologies. Practical applications of these coatings in the aerospace industry, offshore structures, and electronics and sensors are also examined. This comprehensive review offers valuable insights into the development and application of high-performance coatings containing organic and inorganic additives for effective and sustainable corrosion protection.