In this paper we report a male infant heterozygous for thalassemia with a mild glucose 6 phosphate dehydrogenase deficiency. The molecular basis of this new Class III G6PD variant is a G-->T mutation at nucleotide 34 in the exon 2, which predicts a Val-->Leu aminoacid substitution at codon 12. We designated this variant as G6PD Sinnai from the place of birth of the propositus.