Immunohaematology is branch of blood transfusion science, which studies antigen-antibody reaction and its relationship/association with the pathogenesis, and clinical manifestations of blood disorder. The aim of this scientific group is to start off the professional improvement of the blood transfusion practices in Saudi Arabia, as per the Saudi Society of Transfusion Medicine (SSTM) vision, with great emphasis on the serological and technical issues. On behalf of the SIG and SSTM board members, I would like to welcome you all to this webpage.