Il numero romano MCMIII nel sistema decimale vale: 1903.
MCMIII in latino si scrive mille nongenti tres,
mentre in italiano millenovecentotré.
MDCCCLXXXIV, MDCCCLXXXV, MDCCCLXXXVI, MDCCCLXXXVII, MDCCCLXXXVIII, MDCCCLXXXIX, MDCCCXC, MDCCCXCI, MDCCCXCII, MDCCCXCIII, MDCCCXCIV, MDCCCXCV, MDCCCXCVI, MDCCCXCVII, MDCCCXCVIII, MDCCCXCIX, MCM, MCMI, MCMII, MCMIV, MCMV, MCMVI, MCMVII, MCMVIII, MCMIX, MCMX, MCMXI, MCMXII, MCMXIII, MCMXIV, MCMXV, MCMXVI, MCMXVII, MCMXVIII, MCMXIX, MCMXX, MCMXXI, MCMXXII