The Lent Bumps 2005 were a series of rowing races held at Cambridge University from Tuesday 1 March to Saturday 5 March 2005. The event was run as a bumps race and was 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 2005, a total of 121 crews took part (69 men's crews and 52 women's crews), with nearly 1100 participants.