Abstract Very little is known about how Indian diplomats have made sense of the change in political power in New Delhi since 2014, when the election of Hindu nationalist Prime Minister Narendra Modi signalled a radical break from the internationalist credo of the Nehruvian Congress establishment. Attending to this gap in knowledge, this article engages with the ongoing debate about the influence of Hindu nationalism on Indian diplomacy, but departs from the conventional emphasis on foreign-policy analysis or Modi's persona. Instead, it centres on the lived experience of career diplomats in the Indian Foreign Service to whom it falls to conduct everyday diplomacy under Hindu nationalist rule. This focus invites a broader question in the global age of populism: how do contemporary diplomatic services adjust to the arrival of nationalist governments? I suggest that the delays in internalization of nationalist norms and diplomatic practices are only partly a function of ideological misalignment between an internationalist bureaucracy and a nationalist government. What matters is also the extent to which the status of the social class represented by the bureaucrats is invalidated by the government's political project. Building its arguments on the back of 85 elite interviews and archival research in India, the article considers changes to diplomatic discourse, protocol, priorities and training, and details how Indian diplomats have adjusted to and resisted Hindu nationalism. It suggests that we study nationalist critiques of ‘cosmopolitan elites’ both as an ideological denunciation of internationalist commitments and as a social rejection of the elites who hold them.