Gene therapy is no longer an experimental approach. We are now witnessing the advent of genes as medicinal products, based on stable expression of therapeutic genes. Laboratoryborne viruses, also known as viral vectors, can efficiently deliver genes to the cells they infect, with lentiviral vectors (LVVs) one of the most widely used. This article will review existing lentivirus-manufacturing technologies and how they need to be adapted to meet the current market demand, from the perspective of VIVEbiotech -a CDMO manufacturing LVVs to EMA and FDA standards for use in clinical trials.