Verify the level of loneliness and its relationship with socioeconomic and health conditions, social support, family functionality, and depressive symptoms in patients undergoing hemodialysis. Analysis of secondary data, with a primary cross-sectional investigation, correlational with a quantitative approach, carried out in 2019, with 80 patients with CKD on hemodialysis. Applied instruments: socio-demographic, economic, and health condition characterization, UCLA Loneliness Scale, Medical Outcomes Study Social Support Scale, Patient Health Questionnaire9, and the Family APGAR. Showed female prevalence (55%), white ethnicity (65%), and mean age 59.63 years. In the perception of loneliness, the highest index was (55%), moderately high. Social support scored worst in the Positive Social Interaction domain, mean 74.31. In depression, showed prevalence of severe depression (28.7%). Family functioning showed good score (68.8%). There was a weak negative correlation between loneliness and all domains of Social Support, besides Family Functioning.