Hydrogels are excellent biomaterials for biomolecule delivery and tissue engineering. Some of the hydrogels are injectable; an important property that enables the hydrogel precursor to set right away after injection. This helps them to stay in place (say in vivo) and keep the molecule in the target area for sustained and long term release, or fill the cavity for regenerating the lost or damaged tissue. In-situe delivery and 3D bioprinting are important applications of this type of hydrogels. Shear-thinning hydrogels are a special category of injectable hydrogels that are already set before injection, however flow under a certain amount of shear stress (like during injection), and set back to hydrogel after the shear stress is released. This expands the range of biomaterials that can be used for applications demanding injectable hydrogels, such as biomaterials that form hydrogels at room temperature and cannot recover if subjected to shear-stress. So, making benefit of nanomaterials interaction with biomaterials to make shear-thinning hydrogels are of particular interest in drug delivery, tissue engineering and 3D bioprinting.