SYNOPSISA study was made on 129 obese children to assess the relation of fasting plasma concentrations of cholesterol and triglyceride with clinical features of obesity.Mean values for both plasma cholesterol (195 mg/dl) and triglyceride (77 mg/dl) did not differ from those found in non‐obese children. Greater than expected numbers of children however were found with raised values of either cholesterol or triglyceride. Three children were found to have familial Type II hyperlipoproteinaemia, and eighteen were found to have a fasting triglyceride of greater than 120 mg/dl. No correlation was found between plasma cholesterol values and clinical features of obesity, but significant correlation was found between plasma triglyceride values and degree and duration of obesity, particularly amongst those children whose obesity started after the first year of lif