<p>This meta-analysis systematically reviewed 40 independent studies (57 effect sizes, 28,743 participants) to examine the association between materialism and digital addiction, as well as potential moderators. The results revealed a significant moderate positive correlation (<i>r</i> = 0.36, 95% CI = [0.32, 0.41], <i>p</i> &lt; 0.001). Digital addiction subtype was the only significant moderator: online compulsive shopping tendency yielded the strongest association (<i>r</i> = 0.50), followed by social media addiction (<i>r</i> = 0.34), smartphone addiction (<i>r</i> = 0.30), and general internet addiction (<i>r</i> = 0.24). No significant moderating effects were found for cultural context, age stage, female proportion of participants, or publication year. Publication bias tests showed no obvious asymmetry, and sensitivity analyses confirmed the robustness of the overall findings. This study validates and extends Self-Determination Theory and Social Comparison Theory by clarifying the mechanisms linking materialism to digital addiction. It also provides practical implications for digital addiction prevention and intervention, including cultivating non-materialistic values, delivering media and financial literacy education, and optimizing regulation on digital platforms.</p>