The Lent Bumps 2004 were a series of rowing races held at Cambridge University from Tuesday, 24 February 2004 until Saturday 28 February 2004. The event was run as a bumps race and is one of the series of Lent Bumps which have been held annually in late-February or early March since 1887. See Lent Bumps for the format of the races. In 2004, a total of 121 crews took part (69 men's crews and 52 women's crews), with nearly 1100 participants in total.