In the present investigation, the essential oil compositions of four individual plants from Scrophulariaceae family cultivated in Vietnam were reported. The air-dried plants were hydrodistilled (Vietnamese Pharmacopoeia) and the oils were analyzed by gas chromatography-flame ionization detector (GC-FID) and gas chromatography-mass spectrometry (GC-MS) techniques. The essential oils content varied between 0.15% and 0.40% (v/w) on a dry weight basis. Monoterpenes (74.0%â85.1) represent the main class of compound in the oils. Adenosma bracteosa Bon., afforded oil whose major compounds were carvacrol (37.2%), carvarol methyl ether (23.2%), α-bisabolene (15.9%) and γ-terpinene (9.2%). The oil of Adenosma indiana (Lour.) Merr., comprised mainly of limonene (25.1%), 1,8-cineole (20.1%) and α-pinene (17.2%). However, methyl benzoate (27.7%), pulegone (23.4%) and limonene (20.2%) were the significant compounds of Limnophila aromatica (Lour.) Merr., while Limnophila micrantha (Benth.) Benth., gave oil whose main compounds are mentha-1,5,8-triene (38.5%) and β-myrcene (24.4%).