The May Bumps 2005 were a series of rowing races held at Cambridge University from Wednesday 15 June 2005 until Saturday 18 June 2005. The event was run as a bumps race and have been held annually in mid-June since 1887. See May Bumps for the format of the races. In 2005 a total of 171 crews took part (94 men's crews and 77 women's crews), with around 1500 participants in total.