Nostalgic rhetoric is common among populist radical right parties. This has made some observers ascribe nostalgia––a rose-colored memory of the past––to radical right electorates. However, it remains unclear whether such nostalgia is about group-based or personal issues and how these different nostalgia contents relate to radical right support. I argue that nostalgia for group-based contents predicts radical right support because it creates group-based temporal relative deprivation: Individuals’ nostalgic positive memories set an extraordinarily high standard that society’s present hardly can match. The relative deprivation caused by the contrast between society’s rose-colored past and its realistic present creates dissatisfaction, which is attributed to political elites and outgroups. Therefore, individuals support parties that promise to restore society’s favorable past. In contrast, nostalgia for personal issues does not have such an effect because most individuals’ present is pleasant enough to match their positive memories, therefore preventing personal relative deprivation. Two preregistered studies on Dutch panel data examine how different contents of nostalgia predict radical right support. In Study 1, nostalgia for group-based content (e.g., society, people) predicts stronger radical right support. Nostalgia for personal content (e.g., family, childhood) instead attenuates support. In Study 2, I show that radical right voters are not more nostalgic in general. Instead, while group-based nostalgia again predicts radical right support, the general frequency and importance of nostalgic experiences are less relevant. Together, this paper refutes the assumption that nostalgia generally motivates radical right support. Instead, only longing for society’s past drives these effects.