Older adults spend up to 23 h daily sitting or lying while in hospital. Sedentary behaviour (SB) within a hospital setting is often associated with poor health outcomes including physical and cognitive decline, reduced quality of life and death as well as hospital readmissions. Conversely, replacing SB with mild to moderate levels of physical activity such as walking can significantly reduce hospital readmission risk by 30 days. Given the potentially harmful effects of SB in hospitalised older adults, it is vital to identify current literature by broadly exploring different aspects of SB among older people in hospital. The overall aim of this scoping review is to produce a literature map of current evidence on key domains of sedentary behaviour in hospitalised older people. A search for relevant publications will be undertaken in Pedro, MEDLINE Ovid, Cochrane, Scopus, Cumulative Index to Nursing and Allied Health Literature, PsychInfo, Embase, Ageline, Joanna Briggs Institute (JBI) and clinical trials registries. Publications in English and those where the author can provide the full text in English will be included. Studies conducted in hospitals (including in-patient rehabilitation facilities) or acute and subacute care settings and in people aged ≥ 65 will be included. A three-stage method will be used to identify relevant articles, consisting of database search using keywords, keywords and index words across all databases, and reference searching. Articles will be selected following screening of titles/abstracts succeeded by a full-text appraisal utilising a standardised selection form. Two independent reviewers will extract data using the standardised form that will be tested on two articles. A narrative summary will accompany results presented in tables and figures.