Dalia M. Jamil, Abdulhadi Kadhim, Ahmed A. Al-Amiery, Ayad F. Alkaim, Ahmed K. Al-Okbi, Khalid S. Rida, Mahdie M. Hanon, Abdul Amir H. Kadhum, Carbethoxythiazole Corrosion Inhibitor: As an Experimentally Model and DFT Theory, Journal of Engineering and Applied Sciences, Volume 13,Issue 11, 2018, Pages 3952-3959, ISSN 1816-949x, jeasci.2018.3952.3959, (https://makhillpublications.co/view-article.php?doi=jeasci.2018.3952.3959) Abstract: Inhibitor for mild steel derived from carbethoxythiazole namely 2-amino-4-methyl-5-carbethoxythiazole was synthesized and the chemical structure was elucidating by fourier transform in frared and nuclear magnetic resonance spectroscopies. The inhibition efficiency for 2-amino-4-methyl-5-carbethoxythiazole to inhibit the damage effects for mild steel of corrosion in 1 M hydrochloric acid solution was figured and was 82.5% regarding to weight loss technique. Scanning electron microscopy was used as a confirmation of ability of 2-Amino-4-Methy l-5-Carbethoxythiazole (AMC) to inhibit the corrosion of specimens of mild steel surface. The standard free energy of adsorption and adsorption equilibrium constant were calculated and the adsorption of 2-amino-4-methy l-5-carbethoxythiazole on surface of mild steel was obey adsorption isotherm of Langmuir. To proof the methodological findings, density function theory at the B3LYP/6-311+G** level of theory was used to calculate highest occupied with lowest unoccupied molecular orbitals energies and dipole moment. Keywords: Carbethoxythiazole;FT-IR;NMR;CHN;corrosion inhibitor;inhibit