How people perceive outgroup prosocial behaviors is an important but under-researched aspect of intergroup relations. In three experiments conducted in two cultural contexts (Italy and Kosovo) and with two different populations (adolescents and adults; N = 586), we asked participants to imagine being offered help by an outgroup versus ingroup member. Participants attributed fewer prosocial motives to and were less willing to accept help from the outgroup (vs. ingroup) member. This was particularly true for highly prejudiced participants and when the outgroup was described negatively. Participants' perceptions of the outgroup helper's prosocial motives and expected quality of the interaction with the helper mediated the effect of helper's group membership on willingness to accept the help (Experiment 3). We discuss the theoretical and practical implications of these findings for intergroup relations.