This study examines the social identity of 384 high school students from four age levels (10, 12, 15 and 17 years‐old) in Puerto Rico. This complex society represents an interesting context because of the potential relevance of a number of dimensions for identity including language, cultural heritage, economic status, religion and political beliefs. An important methodological refinement is introduced in order to permit simultaneous examination of these various dimensions in terms of Puerto Rican identity. Three major dimensions of the students' social identity emerged from multidimensional scaling analyses and these were seen to contrast with previous research on ethnic identity in Canada, the United States and Wales.