The Lent Bumps 2003 were a series of rowing races held at Cambridge University from Tuesday 25 February 2003 until Saturday 1 March 2003. The event was run as a bumps race and has been held annually in late-February or early March since 1887. See Lent Bumps for the format of the races. In 2003, a total of 121 crews took part (69 men's crews and 52 women's crews), with nearly 1100 participants.