The aim of this study was to assess the impact of ethnicity on urodynamic outcomes. The urodynamic studies (UDS) of 100 women were analysed; 41 were of white Caucasian origin, 35 of Asian origin and 24 of African origin. The presence of detrusor overactivity (DOA) in the three ethnic groups was compared and the nature of DOA in terms of cystometric capacity, volume of strong desire, maximum flow rate (Qmax), volume at which DOA occurred, mean amplitude of contraction and number of contractions, were compared. Asian (p < 0.003) and African (p < 0.008) women were more likely to have a diagnosis of DOA compared with white Caucasian women. There was no difference in UDS outcomes when comparing Asian and African Women. The ethnicity did not appear to impact significantly on the nature of the DOA. Women of Asian and African origin attending for UDS presented with DOA more commonly than those of white Caucasian origin.