Abstract: Disclosed are a rubber composition for a dynamic damper and a dynamic damper including the same. The rubber composition may include a resin including ethylene-propylene-based rubber and halogenated isobutylene-isoprene rubber, a filler, a plasticizer, a crosslinking agent and a vulcanizing accelerator. For example, the rubber composition may be prepared by mixing the resin including the ethylene-propylene-based rubber and the halogenated isobutylene-isoprene rubber, the filler, the plasticizer, the crosslinking agent and the vulcanizing accelerator at an optimal mixing ratio, thus increasing the loss factor thereof while decreasing the temperature dependency thereof across the broad range of temperatures to thereby improve anti-vibration characteristics regardless of changes in season or temperature.