In 4 unrelated individuals from the Lambadi tribal population (Khamman district, Andhra Pradesh, South India) slow-moving serum albumin variants were found which differ from all the hitherto reported albumin variants. We therefore designate this new variants 'Albumin Lambadi', In 2 other South Indian tribals (Koyas, West Godavari district, and Konda Kammaras, East Godavari district) no albumin variants were seen. This is the first report on the occurrence of serum albumin variants in any Indian tribal population.