The current study aimed to determine anxiety, depression, and prenatal attachment levels in patients with gestational diabetes mellitus. For a total of 486 women with GDM, the mean Prenatal Attachment Inventory (PAI) score was 67.30 +/- 13.64%. In terms of the Self-Perception of Pregnancy Scale with two factors, the factor 1 score was 21.65 +/- 6.72 and the factor 2 score was 11.26 +/- 3.72. Based on the Hospital Anxiety and Depression Scale-Anxiety (HADS-A) scale, almost half of the patients (48.10%) had normal scores. One-third (32.50%) of the patients had high scores. Based on the Hospital Anxiety and Depression Scale-Depression (HADS-D) scale, more than half of the patients (59.70%) had normal scores. A few (21.80%) of the patients had high scores, requiring support. Results showed a statistically significant correlation between several factors, including the number of children, number of pregnancies, whether pregnancy was intended, emotions after being aware of pregnancy, and mean scores for the scales used in this study (p < 0.05). In the current study, although most of the pregnant women were diagnosed with gestational diabetes mellitus after becoming pregnant, prenatal attachment scores were high. Additionally, one-third of the patients with gestational diabetes mellitus had high anxiety and depression scores. Moreover, body perception was moderate, while maternal perception was high.