This study examines the impact of ownership concentration (OC) on bank credit risk in Türkiye, using panel data from 14 commercial banks covering the period 2003–2020. Employing panel regression analysis, the findings show a positive and significant effect of OC on non-performing loans (NPLs), suggesting that higher OC increases credit risk. Control variables include bank size, return on assets, deposits, consumer price index (CPI), and GDP growth. The results highlight OC’s dual role in both enhancing monitoring and increasing risk-taking.