This chapter discusses recent developments of injectable biomimetic hydrogel systems found in soft tissue repair applications. It begins by introducing how biomimesis and biomaterials are related, and how tissue repair systems can be considered biomimetic. We introduce hydrogels by discussing their classification, synthesis and applications, then discuss how injectable biomimetic hydrogels have been investigated for use in soft tissue repair. Different approaches to the use of biomimetic hydrogels for soft tissue repair are covered, focusing on synthetic, non-biodegrable polymers. We include so-called conventional polymers and more biomimetic polymers. The chapter concludes with the likely future trends and highlights further reading materials.