This study examined the role of forensic accounting techniques in fraud detection and prevention in Deposit Money Banks (DMBs) in Nigeria. A quantitative research design was adopted, and primary data were collected through structured questionnaires administered to 120 respondents drawn from accounting, auditing, finance, and internal control units of selected banks. The data were analyzed using descriptive statistics and regression analysis to test the formulated hypotheses. The regression results revealed that forensic accounting techniques have a significant positive effect on fraud detection and prevention in Deposit Money Banks in Nigeria. Specifically, forensic accounting techniques significantly influenced fraud detection (β = 0.72, p = 0.000) and fraud prevention (p = 0.001). The model further showed a strong explanatory power with an R² value of 0.66, indicating that 66% of the variation in fraud detection and prevention was explained by forensic accounting techniques. Additional findings indicated significant relationships between forensic accounting techniques and internal control systems as well as overall fraud management (p < 0.05). The study revealed that forensic accounting techniques enhance transparency, accountability, and fraud control in Deposit Money Banks in Nigeria.