ObjectiveLongitudinal learning often faces implementation challenges within UK medical schools. Some have suggested that the hidden curriculum may be implicated, but there is little evidence regarding how the hidden curriculum influences student experiences of, and engagement with longitudinal learning. Given this, our objective was to explore the impact of the hidden curriculum on student experiences of a longitudinal curriculum based in primary care at a research-intensive medical school.DesignWe conducted a longitudinal qualitative study. Students participated in three serial, in-depth semistructured interviews. We conducted a longitudinal thematic analysis.SettingOne research-intensive medical school based in the UK. Data collection occurred in 2021–2022.Participants12 penultimate year medical students taking part in a longitudinal primary care placement for 1 day a week over the course of one academic year.ResultsWe constructed four themes capturing insights on how hidden curricula influenced students’ experiences: (1) A culture which stresses assessment influences student engagement with longitudinal learning; (2) Longitudinal relationships can challenge the hidden curriculum; (3) Support and continuity within primary care improves skills and can influence belonging and (4) Logistical issues influence engagement with longitudinal learning.ConclusionsThe hidden curriculum, particularly related to assessment, plays a large role in student perceptions of educational value and subsequent engagement with curricula. In a research-intensive institution, longitudinal learning, particularly within primary care, was perceived as at odds with what was important for assessments. Where longitudinal relationships were successfully established, students became more aware of the benefits of person-centred practice. For primary care longitudinal education to succeed in more research-intensive institutions, there must first be advocacy for greater representation of primary care and person-centred values within organisational structures to ensure meaningful curricular alignment.