Objective : Being overweight or obesity impairs quality of life and often causes treatment noncompliance in patients with bipolar disorder. This preliminary study evaluated the prevalence of overweight and obesity in inpatients with bipolar mania. Methods : Inpatients with bipolar mania, who were treated with adequate medications at least 4 weeks were included in a retrospective study. The body weight of each patient was measured and the body mass index (BMI) was calculated. Results : Of the 80 patients, 16.4% (N=13) were overweight, and 35.0% (N=28) were obese at discharge. Female patients had higher prevalence rates of overweight and obesity. Being overweight or obesity was associated with the number of previous episodes of depression and combination treatment with atypical antipsychotics and mood stabilizers. Conclusions : Being overweight or obesity is highly prevalent in patients with bipolar mania. Clinicians should pay more attention to weight gain and obesity when prescribing combination therapies. More research is required to identify the impact of specific risk factors for overweight and obesity in patients with bipolar mania.