In Portugal, studies on discrimination against immigrants have focused almost exclusively either on the indigenous population, or on the foreign population. The former have tended to deploy quantitative and extended methodologies, while the latter studies have opted predominantly for qualitative or intensive methodologies, focusing on particular groups. There are few studies in which the immigrant population is extensively surveyed, covering its diverse origins, life trajectories, and social position in the host society.In this analysis we examine the main factors that shape the perceptions of ethnic and racial discrimination among immigrant groups living in the Oeiras municipality in the Lisbon Metropolitan Area. This analysis is based on a quantitative analysis of a survey of 422 immigrants, of whom approximately half reported having been discriminated against since their arrival in Portugal. The study is focused on three main explanations related to predictive variables: sociographic, acculturation/cultural proximity, and opportunities for contact with the autochthonous population. A multivariate logistic regression demonstrates that there is a statistically significant relationship between perceived discrimination and some sociographic variables including cultural proximity, especially for Brazilians.