Feasibility, acceptability, and preliminary efficacy of an internet-based CBT intervention for loneliness in older adults: A pilot RCT

•A newly developed intervention for loneliness was tested in older adults.•The intervention was delivered via the internet and was based on CBT principles.•A pilot RCT was conducted comparing the intervention to a wait-list group.•The intervention was found to be feasible and acceptable in older individuals.•Efficacy results are promising and point at age-specific treatment effects.