Walnut oil, well-known for its nutritional value, is a promising source of healthy lipids. This study assessed the physicochemical properties and levels of volatile compounds, glycerides, tocopherol, phytosterols, and triterpene alcohol in 31 commercial walnut oil samples from different countries: China (with 27 samples), France (with 3 samples), and Germany (with 1 sample). The percentage content of unsaturated fatty acids in walnut oils exceeded 90 %. A total of 93 volatile compounds were identified, and the corresponding concentrations ranged from 28.02 to 528.37 mg/L, including 22 aldehydes, 14 acids, 22 alcohols, 10 alkanes, 13 ketones, 4 alkenes, 6 esters, and 2 pyrazines. 58 glycerides were identified, with concentrations of 568.59–2056.53 mg/kg. TG (54:2), TG (54:3), and TG (54:7) were the top three glycerides. Five types of phytosterols were identified, with levels of 568.48 mg/kg - 2364.68 mg/kg. γ-tocopherol was the most abundant tocopherol, ranging from 51.18 mg/kg to 1832.55 mg/kg. Total triterpene alcohol ranged from 106.73 to 717.64 mg/kg, including taraxerol, cycloartenol, and parkeol, etc. The results indicated that there were slight differences in the chemical composition of walnut oils among different regions or countries. Notably, walnut oil was a good source of unsaturated fatty acids, phytosterols, and tocopherols.