Objective The purpose of the study was to develop an integrated self-management program which could cover expected weaknesses from separately controlled obstetrics and internal medicine departments and evaluate the positive effects of each on self-management, glycemic control, and maternal identity in women with gestational diabetes mellitus(GDM). Methods The0 integrated self-management program was developed to synthesize contents and methods in the management of glycemic control and maternal identity approach. The study period for this program was five weeks and included small group meetings and supportive counseling by telephone. The program was conducted 3 out of 5 times for 1 hour small group meeting and 2 out of 5 times by telephone-counseling. The integrated self-management program was verified by an expert panel. A total of 55 GDM women were recruited from Cheil General Hospital, Seoul, Korea and were assigned to an experimental (n=28) or control group (n=27). The participants were 24-30 weeks pregnant women who had been diagnosed as GDM as of July 30, 2010. Exclusion criteria were a history of diabetes mellitus not related to pregnancy or the presence of high risk disease such as pregnancy induced hypertension. The study was a quasi-experimental pre-post design. Self-management and maternal identity were measured before and after the study. Glycemic control was measured by 2-h postprandial glucose and HbA1c. Self-management and maternal identity were measured by structured questionnaires. χ2-tests and Mann-Whitney U tests were used to compare the differences between the two groups. Results Although there was no significant reduction in HbA1c (z=-1.179, p=.238), there were statistically significant increases in self-management (z=-3.802, p＜.001) and maternal identity (z=-4.489, p＜.001), and decreased 2-h postprandial glucose levels (z=-2.434, p＜.015) in the experimental group compared to control group. Conclusion These findings suggest that participation in an integrated self-management program for GDM women improves self-management, maternal identity, and glycemic control. Further studies are needed to identify the effects of an integrated self-management program on pregnancy and neonatal outcomes, and to suggest repeated research for pregnant women to suggest care of GDM management.