Abstract: The subject filleting knife has a cutting element having two cutting edges starting from the juncture of the blade element and handle and extending to a point part way along the element at which the two edges merge into a single edge. The knife thus serves the functions of both single blade and double blade filleting knives. It allows a significant improvement in the efficiency of the process of filleting in terms of time, skill and care required relative to the quality of the fillets produced and reduction of wastage. Safety is enhanced.