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Introduction Musculoskeletal (MSK) conditions affect over 20 million people in the UK and account for one in seven General Practitioner (GP) consultations. To address capacity challenges, First Contact Physiotherapists (FCPs) now manage MSK patients in primary care. However, FCPs working in isolation from physiotherapy teams exhibit broad variation in decision-making that could pose risks to care quality. PRimary Care Individual Social Norms MSK Data Dashboard (PRISM) is a clinician-facing behaviour change digital dashboard that provides individualised social norms feedback such as, ‘you are in the top 10% of those referring to secondary care’ or ‘in the bottom 10% of those referring to social prescribing’. It aims to nudge FCPs towards evidence-based norms, including more effective and cost-efficient treatments, thereby reducing unwarranted variation in care and improving patient outcomes. Social norms interventions have been shown to positively influence clinician behaviour, but their application in MSK services remains unexplored.Aim To determine the feasibility of evaluating PRISM’s effectiveness and cost-effectiveness in a future clinical trial.Methods and analysis A pragmatic feasibility cluster randomised controlled trial will be conducted across four UK primary care sites with FCP services. Sites will be allocated 1:1 to intervention (PRISM dashboard, guidebook and structured clinical supervision) or control (usual care). Data on clinical decision-making will be collected monthly and anonymised for dashboard generation and compared to an existing dataset of over a million FCP consultations. Patients seen by FCPs will be invited to provide patient-reported outcome measures and experience measures. Feasibility outcomes include recruitment and retention of sites, FCPs and patients; dashboard engagement and completeness of data collection.The primary outcome is recruitment feasibility. Secondary outcomes include retention, dashboard usage, patient-rated outcome measure/experience measure (patient-rated outcome measures/patient-rated experience measures) completion and supervision engagement. Descriptive analyses will summarise feasibility metrics and missing data. Health economic and carbon reduction data collection will also be assessed for future trial planning.Ethics IRAS number 361 359. REC reference: 25/EM/0256, Approved: 10 December 2025 based on PRISM Protocol V.9. Dated 25 November 2025.Trial registration number NCT07112508.Dissemination Findings from the PRISM feasibility trial will be disseminated through peer-reviewed publications, conference presentations and stakeholder engagement. Results will also be shared with participating sites, patient and public involvement representatives and professional bodies such as the Chartered Society of Physiotherapy to inform clinical practice and policy. Additionally, lay summaries will be produced for patients and the public and digital channels will be used to maximise reach.