“…None of the intervention descriptions had a complete account of their underlying theoretical framework or likely mechanisms of action related to loneliness and/ or social isolation and most described the intervention components (aim, objective, setting, target group, resources required) relatively sparsely. The included interventions were heterogeneous in their design: 11 were delivered at an individual level (Alvarez-Jimenez et al, 2020;Bruehlman-Senecal et al, 2020;Coelho et al, 2017;Gantman et al, 2012;Lim et al, 2020;Lim et al, 2019;Orkibi et al, 2017;Rice et al, 2020;Saulsberry et al, 2013;Stewart et al, 2011;Zhang et al, 2018), with two of these having a community element (Alvarez-Jimenez et al, 2020;Rice et al, 2020), and one having a structural element (Coelho et al, 2017), and five were delivered solely at community level (Afsharnejad et al, 2020;Maslow et al, 2013;Matthews et al, 2018;Smith et al, 2017;Stewart et al, 2009). One targeted social isolation (Coelho et al, 2017), whereas the remaining 15 targeted loneliness (Afsharnejad et al, 2020;Alvarez-Jimenez et al, 2020;Bruehlman-Senecal et al, 2020;Gantman et al, 2012;Lim et al, 2020;Lim et al, 2019;Maslow et al, 2013;Matthews et al, 2018;Orkibi et al, 2017;Rice et al, 2020;Saulsberry et al, 2013;Smith et al, 2017;Stewart et al, 2011;Stewart et al, 2009;Zhang et al, 2018).…”