A razor strop is a flexible strip of leather used to straighten and polish the blade of a knife, or a woodworking tool like a chisel. Unlike honing or sharpening a blade, in which a whetstone removes metal bent out of alignment from the blade's edge, stropping the blade re-aligns the indentations without removing any material.

Various abrasive compounds may be applied to the strop to aid in polishing the blade while stropping to obtain a mirror-like finish. The properties of the compound applied will alter the polishing result. Jeweller's rouge is a very fine abrasive compound. The green Chromium(III) oxide compound is most often used as an abrasive compound. Sprays containing diamond particles are another option.