The RMS-106 Hizack (aka Hi-Zack) is a mass-production general-purpose mobile suit introduced in Mobile Suit Zeta Gundam. It was based on the MS-06 Zaku II series and was used by EFF groups, including the Titans, during the Gryps War.

A mass-produced mobile suit developed at Granada with help from Anaheim Electronics, which absorbed the Zeonic Company which was once the major mobile suit developer for the Principality of Zeon. While the Hizack's external appearance resembles that of Zeon's famous Zaku II, it was a vast improvement over the older mobile suit. The Hizack's design incorporated both Earth Federation and Zeon technologies, with the latter contributing to it having the same high operating reliability and ease of production as the Zaku II. Data from the MS-06F2 Zaku II F2 Type was also referenced during development.

The Hizack is outfitted with a titanium alloy ceramic composite armor and has a higher output generator than that of a Zaku. It is also faster and more agile than its predecessors and is easy to pilot. The Hizack is most often equipped with a 120mm machine gun kai, beam saber, or heat hawk. It sometimes uses a beam rifle, but due to its low generator output, it can only carry one beam weapon at a time. The Hizack can also be equipped with missile pods. Although the Titans were assigned to wipe out the remnants of Zeon forces, their Hizack uses a similar dark green color scheme. Meanwhile, the regular Earth Federation Forces used a dark blue color for their units.