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Abstract Background While the underlying neuropathology of dementia is not curable, interventions and treatment, such as physical activity, can offer physical and functional gains leading to better mobility, independence and quality of life. The Seniors Exercise Park program is an evidence-based physical and social activity program using an innovative design in outdoor exercise equipment specifically designed for older people. This unique program has never been tested with older people living with dementia. This study will evaluate the feasibility of delivering the Seniors Exercise Park program for people living with mild to moderate dementia in residential aged-care. This study will identify the optimal physical activity program, evaluate the safety of equipment usage and determine optimal supervision needs. The potential physical, social, quality of life and cognitive benefits of participation in the Seniors Exercise Park program will also be examined. Methods This is a feasibility pilot randomised controlled design with pre-post evaluation. Adults aged ≥ 60 years who have symptoms of dementia and/or who have been diagnosed with dementia will be recruited from an aged-care facility in Melbourne. Participants allocated to the intervention group will undergo a 12-week structured supervised physical activity program using the outdoor Seniors Exercise Park equipment followed by a 12-week maintenance phase (unstructured physical activity). Participants will be assessed at baseline, 3 and 6 months. Participants allocated to the control group will attend activities provided by the aged-care facility. A sample of 12 participants per group is the targeted sample size. Feasibility will be evaluated in terms of recruitment rate, retention, attendance, overall adherence, dropout rate, adverse events, modifications to the exercise program delivery and supervision needs. A comprehensive suite of cognitive and health-related questionnaires and physical function measures will also be collected. Discussion The ENJOY program for independence in dementia will determine the suitability of the Seniors Exercise Park program for people diagnosed with mild to moderate dementia. Outcomes could inform future design of dementia-friendly built environments to increase physical activity participation for residential aged-care facilities. Trial registration This trial is registered with the Australian New Zealand Clinical Trials Registry—Registry Number ACTRN12620000733976 . Registered on the 13th of July 2020.