This paper develops and tests hypotheses concerning the effect of migrant status and ethnicity on propensity to engage in entrepreneurship (defined as new business activity) at the individual level in the UK. The hypotheses are tested using bivariate analysis (Pearson tests of independence) and multivariate analysis (binary logistic regression). Bivariate analysis suggests that new business activity varies with migrant status and ethnicity. Multivariate analysis suggests that migration increases the odds of engaging in new business activity, that the independent effect of ethnicity is marginal, and that being a recent ethnic minority migrant decreases the odds, after controlling for other individual level factors. At the regional level, a preliminary analysis suggests that gross migration flow has a higher correlation with new business activity than other commonly used regional demographic or economic development measures.