Introduction Overweight and obesity involve abnormal or excessive fat accumulation and are considered a risk to health. A common measure of obesity is the Body Mass Index (BMI), which is obtained from dividing the weight of the individual (in kilograms) on the square of his or her height (in meters). A BMI equal or more than 25 is considered overweight, while a BMI of 30 and above is considered obese. A weight that is higher than what is regarded as a healthy weight for a given height is considered overweight or obese. 1 Globally, overweight and obesity are considered to be the 5th leading risk for deaths, 2 with an estimation of 2.8 million annual deaths among adults. 3 Overweight and obesity are wellrecognized risk factors for increasing the prevalence of different chronic diseases, including cardiovascular diseases, diabetes, and cancer. The estimated number of overweight adults in the world, according to a recent report, was 2.1 billion in 2013, compared to 857 million in 1980. 4 According to WHO, the prevalence of obesity worldwide has nearly tripled since 1975. In 2016, the prevalence of overweight and obesity in adults aging eighteen years and over was 39% and 13% respectively. Overweight and obesity are responsible for more deaths than underweight in countries where most of the overweight and obese people live. 5 Background and objective: Overweight and obesity are important risk factors for the development of some important chronic diseases and are, thus, considered leading risks for deaths. This study aimed to find out the prevalence of overweight and obesity with their associated risk factors in the adult population. Methods: A household cross-sectional survey was carried out in Erbil city, Iraq from April to June 2017. The study involved 1480 adults selected through a multi-stage sampling method. A specially designed questionnaire was used to collect socio-demographic and other relevant data from the participants through direct interview. The height and weight were measured for all participants. Results: The overall prevalence of overweight and obesity was 74.3% (33.4% overweight and 40.9% obese). There was a statistically significant association between being overweight and obese and older age groups, female gender, being married, low level of education, unemployment, not smoking, and not performing physical exercises. Following a multivariate analysis age (OR = 2.36, 95% CI = 1.60-3.49), female gender (OR = 2.17, 95% CI = 1.53-3.08), and married status (OR = 1.87, 95% CI = 1.20-2.90) were found to be statistically significant factors associated with overweight and obesity. Conclusion: The prevalence of overweight and obesity in the adult population in Erbil city is very high. This alarming epidemic requires serious consideration of the health policymakers and public health specialists to plan effective and preventive and control measures. Health education is one way through which people's awareness of this important health issue could be raised.