IntroductionOverweight after postnatal period can exposed for different health problems in latter time of mothers. However, it gives little emphasis for postnatal over weight complications and no study done on mothers after postnatal overweight consequence. the aim of this paper is to investigate the prevalence of overweight among lactating mothers at postnatal period.Methodswe employed data from 609 lactating women. Institutional based cross - sectional study was deployed. using bivariable and multiple variable logistic regression modelResultsThe overall prevalence of overweight among lactating mothers was 22.2%. Women aged 25–29 years were 275 in number which is nearly half of the total respondents (45.2%). The mean age was 27.7 _+4.6 SD. Family history of obesity [AOR = 23 (95% 11.976–44.431) eating additional food [AOR 2.0 95% CI (1.104, 3.778l) doing exercise [AOR = 0.26 (95% CI (0.140, 0.4290).ConclusionThe prevalence of overweight was high compared with country Ethiopian demographic health survey data. Occupation, Exercise, Family Obesity history, Wealth index, eats additional meal, nutrition information, and media had significant associated with overweight.