Language teacher identity research, critical approaches to language education, and English for Academic Purposes (EAP), have each grown into considerable areas of scholarship. However, not many studies have addressed topics at the intersection of these triple areas. Therefore, adopting a critical perspective on language teacher identity construction within predominant language ideologies, this study aimed to investigate EAP teachers’ professional identity formation in response to institutional policies in a Sino-British university in China. As part of a larger project, data bodies were collected through a narrative survey completed by 77 faculty members and semi-structured interviews with 36 of them at this transnational English-medium university. The analysis of narratives and interview transcripts through qualitative coding procedures revealed three major aspects of the participants’ institutionalized identities: ‘The EAP teacher’ (comprising three roles: a cog in a machine, a British acculturation agent, and a mock monolingual role model); ‘The safe researcher’ of trendy topics; and ‘The service provider’ seeking promotion. The findings contribute insights into EAP language teacher identity from a critical perspective by documenting how EAP teachers (are obliged to) construct institutionalized identities in relation to language ideologies and educational policies in a transnational higher education context.