Prevalence of Gestational Diabetes Mellitus (GDM) is increasing alarmingly in the south Asian lower incoming countries, and Bangladesh is no exception. However, as far as reviewed, very few studies found to address the socio-economic context and co-morbidities of GDM mothers in Bangladesh, which in the present study depicted especially in urban and semi-urban settings. A cross sectional study was conducted among pregnant women with known GDM, attending for antenatal check- up in BIRDEM Diabetes Centre OPD, Shahabag, Dhaka, Bangladesh in 2016. The study selected 105 GDM patients purposively to collect data with face-to-face-questionnaire, who fulfilled the inclusive criteria. Mean age of mothers was 28.38; (SD=± 4.8) years; and majority (73.3%) of respondents came from urban and semi-urban areas and more than four-fifths (81.0%) had higher family income as Taka 25000 and above. More than two- thirds (68.6%) of them completed graduate above education. More than one-third (38.1%) of them were service holder. Exactly half (50%) of the GDM mothers with co-morbidities had hypertension. Knowledge and screening o f GDM were mostly reported among the higher educated and higher incoming people in urban and semi-urban areas. Study with large sample is highly desired to measure the extent of the problem in broad context.