This article aims to comprehensively examine the relationships between digital addiction, loneliness, and self-esteem among young adults. The widespread use of digital technologies today profoundly impacts the social and psychological lives of young people, particularly, creating a new risk area called digital addiction. Digital addiction is a condition that occurs when individuals use the internet, social media, and digital platforms excessively and uncontrolledly, negatively impacting their daily functioning. This addiction is thought to increase feelings of loneliness and lower self-esteem. In this context, data was collected online from 380 young adults in Turkey as part of the study. The data collection process utilized the Young Internet Addiction Test (YIAT-20), the UCLA Loneliness Scale, and the Rosenberg Self-Esteem Scale, all of which are highly valid and reliable. The findings revealed a positive and significant relationship between digital addiction and loneliness; in other words, individuals with high digital addiction experience more intense loneliness. Additionally, digital addiction was found to have a negative and significant effect on self-esteem, and high digital addiction was found to lower self-esteem. A strong negative correlation was also found between loneliness and self-esteem; it was observed that a sense of social isolation significantly weakened self-esteem. Gender and age variables were found to have limited effects on these relationships. It was observed that women had slightly higher levels of loneliness than men, while men had stronger self-esteem than women. This study makes a significant contribution to revealing the effects of digital addiction on the mental health of young adults. The findings provide guidance for educators, psychological counselors, and policymakers to combat digital addiction and enhance psychosocial well-being. Considering the limitations of this study, it is recommended that future studies conducted in different cultural contexts and using mixed methods further expand the findings.