Loneliness has been described as an aversive emotional state experienced when people’s desire for social connection is not met. Loneliness is widespread—an estimated one in four adults in Australia feels lonely (Australian Psychological Society, 2018) and the rate has increased during the COVID-19 pandemic and related lockdowns and social distancing policies. While the experience of loneliness is considered to be universal (Barreto et al., 2021), it is also implicated in the development and progression of a range of physical and mental health conditions (Park et al., 2020)—as some papers in this collection help to demonstrate. Loneliness itself is not a diagnosable condition, which may explain why the availability of theoretical models and specific assessment and intervention options for loneliness has lagged those for other emotional states such as anxiety, depression, anger, and shame. As loneliness researchers from the disciplines of health, clinical, and music psychology, we have guest edited this collection of short reports to bring readers an update on the understanding, measurement, and intervention strategies to address loneliness in a range of populations and contexts. There are seven papers in the collection. The first is a review and meta-analysis of studies examining the relationship between loneliness and depressive symptoms in children and adolescents (Dunn & Sicouri, 2022). This review included 44 studies published between 1983 and 2021, representing data from 27,214 participants aged 9–18 years. The review established an overall positive correlation between loneliness and depression of r= 0.48, which is consistent with earlier research on adult populations. Interestingly, participant gender and age did not moderate the strength of the relationship between loneliness and depression. The authors spoke of the potential role of health professionals in helping young people to feel part of a group, maintain the quality and quantity of their relationships and experience social rewards. The second paper examined loneliness and sense of belonging in Australian university students, using a comparison of three cohorts of first year students entering a metropolitan university in 2019 (pre-COVID-19), 2020 (first wave of COVID), and 2021 (lifting of public health restrictions)(Dingle, Han, & Carlyle, 2022). This study highlighted the detrimental social impact of COVID-19 and the associated rapid move to isolated online learning for university students in terms of increased loneliness and decreased sense of university belonging for students in the 2020 cohort. These social effects were strongly related to levels of psychological distress. The implications for health professionals and university staff are to help students to develop a sense of connection and belonging at university both in educational activities and in extra-curricular social activities. The third and fourth papers focus on sensory aspects of loneliness such as touch and sound. For people who lived alone during COVID-19 long lockdowns, the absence of social touch was emphasised, and people spoke of a desire to hug their loved ones and to be physically close to other people again. Noone and McKenna-Plumley’s (2022) narrative review argues that elements of presence, absence, and type of touch may impact upon loneliness experiences. Disentangling the relationship