The Lent Bumps 1999 were a series of rowing races held at Cambridge University from Tuesday 23 February 1999 until Saturday 27 February 1999. The event was run as a bumps race and is one of a 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 1999, a total of 121 crews took part (69 men's crews and 52 women's crews), with around 1000 participants in total. Several thousand spectators came to watch, particularly on the Saturday.