This paper presents an experiment investigating the effect of social identity on hiring decisions. The question is whether people discriminate between own and other group candidates. Key features of the experiment are: First, to consider whether they do so in individual, as well as in joint decisions; Second, to document whether the identity of the co‐decision maker matters in joint decisions. Substantial discrimination occurs in both individual and joint decision‐making situations. In joint decisions, decision makers discriminate when deciding with someone from their own group, but not when deciding with someone from the other group.