The study aimed to estimate the prevalence and correlates of overweight and obesity among adults in Iraq. Data from a 2015 nationally representative cross-sectional survey of 3,916 persons 18 years and older were analysed that responded to a questionnaire, physical and biochemical measures. Multinomial logistic regression was utilized to predict determinants of overweight and obesity relative to under or normal weight. Results indicate that 3.6% of the participants were underweight (BMI <18.5 kg/m²), 30.8% had normal weight (BMI 18.5-24.9 kg/m²), 31.8% were overweight (25.0-29.9 kg/m²), and 33.9% had obesity (BMI ≥ 30.0 kg/m²). In adjusted multinomial logistic regression, aged 40-49 years (Adjusted Relative Risk Ratio-ARRR: 4.47, Confidence Interval-CI: 3.39-5.91), urban residence (ARRR: 1.28, CI: 1.14-2.18), hypertension (ARRR: 3.13, CI: 2.36-4.17) were positively, and male sex (ARRR: 0.47, CI: 0.33-0.68), having more than primary education (ARRR: 0.69, CI: 0.50-0.94), and larger household size (≥5 members) (ARRR: 0.45, CI: 0.33-0.60) were negativey associated with obesity. About two in three adult participants were overweight/obese, and sociodemographic and health risk factors were found that can be utilized in targeting interventions.