The V07-0126 Sigrún (ジークルーネ?) is a mobile suit introduced in the Mobile Suit Gundam IRON-BLOODED ORPHANS MSV[1] and appearing in Mobile Suit Gundam IRON-BLOODED ORPHANS G.

The Sigrùn is one of the mobile suits that adopted the Valkyrja Frame developed near the end of the Calamity War over 300 years ago. It was designed under the concept of a high mobility/high output unit that could change the tides of the war, resulting in a high-performance machine. The small but high output thruster units are prominent features of the Sigrún. Close-quarters combat using the Valkyrja Rapier, Sigrún's main melee weapon, is supported by the thruster units mounted on the back and waist. The Sigrún also uses the Valkyrja Round Shield alongside the Valkyrja Rapier, and both weapons as well as the curved design of the mobile suit's armor are reminiscent of knights from the Middle Ages.

The Valkyrja Frame was developed to become a symbol of those who wished to win the Calamity War. However, only a few battle records exist of the Sigrún and other Valkyrja Frame units. This was because mobile suits developed around the same time which used the Gundam Frame swept the battlefield, and the war ended before the Valkyrja Frame units were able to play an active role, causing them to fade into obscurity. So few units were manufactured and only a limited number of people know about them. Despite this, Sigrún and the other Valkyrja Frame units were re-evaluated after the war. Gjallarhorn carried out research based on the design concept of the Valkyrja Frame during the development of its mainstay mobile suits.