Abstract: A one piece molded sheath for fixed blade knives having a blade portion and a contoured handle portion including a forefinger groove separated from the blade portion by a handle ridge. The sheath of the invention is comprised of a blade-contoured sheath pocket for receiving the blade portion and adjacent handle ridge of such knives. The molded sheath pocket has an elongated back wall, a shorter front wall and a pair of side walls interconnecting the front wall to the back wall. The back wall of the sheath pocket in its upper portion has molded-in belt loops for attaching the sheath to the belt of the wearer. A slot in the upper end of each of the side walls of the sheath pocket permit the forward and rearward flexing of the upper portion of the front wall with respect to the back wall by the handle ridge of such knives during insertion thereof into the sheath pocket and withdrawal thereof from such pocket.