The ZGMF-X56S/β Sword Impulse Gundam is a Mobile Suit introduced in the anime Mobile Suit Gundam SEED Destiny. It is piloted by Shinn Asuka and later by Lunamaria Hawke.

The ZGMF-X56S/β Sword Impulse is the ZGMF-X56S Impulse equipped with the β Sword Silhouette pack and is designed to serve as a close combat mobile suit. The Sword Silhouette pack adds two anti-ship laser swords, which can be combined into a larger double bladed sword, and a pair of beam boomerangs to the Impulse's standard armaments of two CIWS, two anti-armor knifes, a beam rifle and a shield. Thanks to the presence of the beam rifle, the suit has no problem engaging in range combat if required. The suit's VPS colors are different from that of the normal Impulse, and is now red, black and white.