String silencers for reducing the sound made when an arrow is released from a bow. These silencers are made from a material which allows the silencer to freely flex when the arrow is released and the bow string begins to vibrate. Silencers usable with conventional bow strings and with split bow strings are disclosed. Disclosed silencers for conventional bow strings have uniform and necked down configurations, and a representative, disclosed silencer for split bow strings has a center segment and integral arms at opposite ends of the center segment. With the silencer at rest, these arms extend in opposite directions from, and at equal angles to, the center segment.