Abstract: The fish hook tying tool provides a rotating fish hook holder for a fish hook, and an adjacently mounted cutter for a fishing line, thus providing a combined tool for assisting a fisherman in tying fishing line to a fish hook and the trimming the knot after tying the fishing line. The fish hook tying tool includes a hollow housing having opposed front and rear walls, the front wall having an arcuate slot defined therein. In use, the user slides a lug along a path defined by the arcuate slot to drive rotation of a drive gear mounted within the hollow housing. Manual rotation of the drive gear drives a pinion to rotate, which, in turn, selectively drives a coaxially mounted fish hook holder to rotate with the shank and eye of the fish hook extending away from the tool. An attached clamp secures the tool to a support.