The ASW-G-56 Gundam Gremory is a mobile suit introduced in the manga Mobile Suit Gundam IRON-BLOODED ORPHANS Gekko. It is piloted by Deira Nadira.

A Gundam Frame owned by the Nadira family, one of the prestigious families that assisted Gjallarhorn's Seven Stars. The Gundam Gremory's most notably feature is that its upper body, including the movable hood that covers it head, is armored with the Nanolaminate Coat, which is stronger than Nanolaminate Armor. The Gundam Gremory utilizes the Nanolaminate Coat's astounding shock resistance capabilities to take on blows from the enemy and perform counterattacks. This material also grants the Gundam Gremory with the highest defensive power among all mobile suits, enabling it to fight and survive the Calamity War that took place over 300 years ago.

The Gundam Gremory is an extremely versatile unit that can lead battles, perform reconnaissance, and undergo solo operations due to its exquisite defensive abilities. Its head is similar to the other Gundam Frames, with twin eyes and antennae, but is rarely seen as it is often covered by the hood. The hood can flip to the back to expose the head, while the armor on the back of each forearm can flip forward when needed. The Gundam Gremory wields an anchor-shaped weapon named the Battle Anchor, but one of its blades was damaged during the Calamity War. As such, the weapon now resembles a massive scythe, and together with the Gundam Gremory's hooded appearance, this mobile suit evokes the image of the Grim Reaper.