IntroductionOlder breast cancer survivors have difficulty accessing rehabilitation interventions addressing activity limitations. Stakeholder input may improve accessibility of interventions. We sought expert consensus on intervention content and delivery features (e.g., where, mode, duration) to inform development of more accessible interventions for this population. Materials and methodsWe conducted a modified Delphi process with patient, clinical, administrative, and research experts. In Round 1, experts evaluated content and delivery features according to domains of feasibility and prioritization. In Round 2, panelists were asked to re-rank or confer agreement of content and delivery features that met Round 1 consensus. Ranking was based on median score. Consensus was defined as a percentage of panelists that ranked an option within one unit of the median. For nominal data, consensus was defined as percent agreement. ResultsPanelists (n = 20) prioritized physical activity strategies (Median Rank: 2; Consensus: 85%) and adaptive skills training (3; 65%). Panelists also prioritized delivery through outpatient services (1; 100%), post-treatment (1; 100%), combination mode of delivery (100%), duration of three months or less (100%) and occurring one to two days per week (100%). DiscussionCancer rehabilitation interventions should be designed with input from stakeholders. The stakeholder intervention priorities identified in this study (e.g., content, setting, and mode) may improve relevance and accessibility of future cancer rehabilitation interventions. Interventions delivered in outpatient clinics and post-treatment using virtual and in-person visits may improve accessibility. Future research should examine the effectiveness and implementation of these intervention characteristics.