The May Bumps 2009 were a series of rowing races held in Cambridge UK. The bumps featured crews from all Cambridge University Colleges and Anglia Ruskin University. They were held from Wednesday 10 June 2009 until Saturday 13 June 2009. The races were run as a bumps race, which have been held annually in mid-June in this form since 1887. See May Bumps for the format of the races. In 2009, a total of 171 crews are expected to take part (94 men's crews and 77 women's crews), with over 1500 participants in total.
Two clubs changed their names in 2009. New Hall became Murray Edwards reflecting the college name change. CCAT became Anglia Ruskin reflecting the change in the University's name a couple of years previously.
1st & 3rd Trinity M1 rowed over to retain the headship gained in 2008 despite determined attacks from Caius on the Friday and Saturday. Caius managed to close to within a third of a length for much of the course on the Friday.
Pembroke W1 also rowed over to retain their headship gained in 2008.