Tissue engineering can be defined as placing fabricated structures into a patient that are designed to aid in the repair of tissue function that may have been lost due to injury or disease. Reactive inkjet printing makes significant contributions to tissue engineering particularly in the formation of fibrin, which is a protein produced by the body to aid repair and is useful due to its role in scaffolds. This chapter discusses the use of reactive inkjet printing in tissue engineering, highlighting areas and applications where reactive inkjet’s contributions are particularly appealing.