A syringe holder assembly that safely and conveniently supports a syringe when it is not being used so as to keep the syringe clean and ready to use with little wasted motion. The syringe holder is configured for holding a syringe having a barrel and a handle and includes a syringe holder and a harness. The syringe holder includes a base configured to be mounted to a ferromagnetic structure; an arm pivotably connected to the base; and a holster connected to the arm. The harness is configured to be secured to the syringe and includes a main strap configured to encircle the barrel of the syringe to retain the harness on the syringe; and a magnet configured to magnetically attach the harness to the holster.