A new and unique x Mangave plant named ‘;Navajo Princess’; characterized by a medium mound of broad, semi-fleshy, longitudinally folded, stiff and upright to outright foliage. The variegated foliage has greyed-green centers with creamy white margins and a frosty green zone between, and with greyed-purple spots toward base that intensify with strong ultraviolet light. Leaves have small, flexible marginal teeth. The new plant is suitable for the garden or as a potted plant in the garden or home.