This study aimed to determine the prevalence and predictors of insulin nonadherence among adults with diabetes mellitus.<h4>Methods</h4>A cross-sectional survey was conducted from February to July 2025 among adults (≥18 years) with type 1 or type 2 diabetes mellitus receiving insulin therapy for at least 6 months, selected using a consecutive sampling technique. The gene discussed is INS; the disease is diabetes mellitus.