The number of older people needing care is increasing, and care is often provided by informal caregivers. The mission of family care advisors (FCAs) is to provide them with support; however, whether and how support in existential matters such as existential loneliness is provided is unclear. Therefore, the aim of this study was to describe FCAs’ views on existential loneliness, and existential support provided to relatives who act as informal caregivers to older people. A national survey was distributed to 349 FCAs in Sweden, response rate n = 120 (36%). The STROBE checklist was followed when presenting the study. Existential loneliness was viewed as thoughts about life and meaning (78%). Existential support was provided by dialogues (87%), visits (75%) and support groups (73%); 45% of FCAs stated that they had time to provide existential support and 27% reported having knowledge of how to encounter existential loneliness. FCAs provide existential support, but often lack experience, knowledge and time. Time and knowledge are important prerequisites for acknowledging existential needs.