Loneliness is a recognized global public health concern and significantly impacts overall well-being. This study aims to determine utility values associated with different loneliness levels and assess the performance of the EQ-5D-5D and EQ-HWB measures in capturing loneliness. Data from an online survey comprising a nationally representative cross-sectional sample of Australian adults was used. The survey included information on demographics, the 20-item Revised UCLA Loneliness Scale (R-UCLA-RS)