Gestational diabetes is a temporary condition that occurs during pregnancy. It affects about 12% of all pregnant women and increases the risk of developing diabetes for both mother and child. Gestational diabetes is prevalent in Bangladesh. The rural population mostly depends on traditional healers (THs) for treatment of this disease. The THs rely on decoctions made from medicinal plants or plant parts to treat gestational diabetes, which decoctions can vary widely between THs in the various districts of the country. The objective of this present study was to conduct an ethnopharmacological survey among the THs of Narail district, Bangladesh to learn about medicinal plants to treat gestational diabetes. In-depth information regarding medicinal plants type, preparation of medicines, ailments for which they are used, dosages, and side effects if any, were obtained from the THs. Medicinal plant samples were later identified at the Bangladesh National Herbarium. The collected information indicates that the following medicinal plants are used to treat gestational diabetes: Nigella sativa, Aconitum napellus, Agaricus albolutescens, Euphorbia cedrorum, Santalum album, Grewia asiatica, Ipomoea aquatica, Prunus communis, Plantago ovata, Phyllanthus emblica, Litsea liyuyingi, Ocimum tenuiflorum, Scoparia dulcis, Carica papaya, Bacopa monnieri, Tamarindus indica, Abrus precatorius, Dillenia indica, and Aloe vera. It was noted in this ethnopharmacological survey that the patients were quite satisfied with treatment by the THs. Since allopathic medicine does not have a cure for gestational diabetes, the above-mentioned medicinal plants are potentially interesting for discovery of novel compounds, which can be effective in controlling or curing gestational diabetes.