 This scoping review examined the existing literature on interventions designed to reduce loneliness and social isolation among older adults. It found that most studies categorized interventions according to their delivery mode, goal, and type. However, there was little consistency in the way these categories were defined, making it difficult to compare studies. Additionally, few studies provided a clear definition of the terms they used. This lack of clarity makes it difficult to draw conclusions about which interventions are effective and why. Future research should focus on developing more consistent definitions of the terms used to categorize interventions, as well as identifying the best delivery modes and goals for each intervention. This article was authored by Olajake Fikoya, Nolene K. McCoy and Michael Donnelly.