CEK-040 Beguir-Beu (ベギルベウ Begirubeu?) is a mobile suit introduced in Mobile Suit Gundam the Witch from Mercury PROLOGUE. It is piloted by Kenanji Avery.

This is an MS developed by Grassley Defense Systems, one of the world's leading heavy industry manufacturers. It is a high-performance machine that incorporates the latest technology in various sections while following the basic structure of Mobile Suits where EMTs (electric motors) are used to move the joints that connect the Link (skeletal structure).