The ZGMF-X23S Saviour Gundam is a Mobile Suit introduced in the anime Mobile Suit Gundam SEED Destiny. It is piloted by Athrun Zala.

The ZGMF-X23S Saviour Gundam is one of ZAFT's five Second Stage Series mobile suits, and like other machines of the series, it inherited the basic performance of the ZGMF-X10A Freedom Gundam and the ZGMF-X09A Justice Gundam, making it superior to the ZAFT's mass production MS in CE 73, the ZGMF-1000 ZAKU Warrior. The design of the Saviour Gundam emphasizes mobility, and not only does it demonstrate high aerial combat capability in MS mode due to its two large wings, it can also transform into a fighter jet-like mobile armor (MA) mode, which has higher acceleration and cruising speed.

With sensor-type devices mounted at the top, the Saviour's head is reminiscent of the GAT-X303 Aegis Gundam's. The Saviour excels in hit-and-run attacks using a combination of its MS and MA modes and is armed with a beam rifle, a shield, two beam sabers, two CIWS guns, two machine guns as well as a pair of beam and plasma beam cannons. It can also operate in space and is equipped with a new form of Phase Shift armor known as Variable Phase Shift armor as well as a battery that can be recharged during battle using the Deuterion Beam Energy Transfer System. As with the ZGMF-X24S Chaos Gundam, the Saviour Gundam is based upon a similar prototype unit, in this case the ZGMF-YX21R Proto-Saviour.