The 2003 Tirreno–Adriatico was the 38th edition of the Tirreno–Adriatico cycle race and was held from 13 March to 19 March 2003.

The race started in Sabaudia and finished in San Benedetto del Tronto.

[2] The race was won by Filippo Pozzato of the Fassa Bortolo team.

Twenty teams, containing a total of 160 riders, participated in the race:[3]