Objective: To determine if family caregiver involvement in interventions with patients with delirium improves patient outcomes.; Methods: A search of three databases (Medline-Ovid, CINAHL and Embase) was conducted. Eligibility criteria included adult patients and involvement of family caregivers in any delirium intervention. Data were extracted from each study (determined by PEDro scale) using a customised form. A meta-analysis was undertaken which compared the length of hospital stay and duration of delirium. PROSPERO registration number is CRD42017077650.; Results: Five studies involving 505 participants published over a 5-year period were suitable for inclusion. Low-level evidence demonstrated family caregiver involvement may reduce caregiver's anxiety and hospital staff viewed administration of education to family caregivers as efficient. Meta-analysis suggested family interventions reduce length of hospital stay for patients with delirium. It remains unclear if it affects the duration of delirium.; Conclusion: Family caregivers providing interventions to patients with delirium can improve patient outcomes.