A new and unique X Mangave plant named ‘;Mayan Queen’; characterized by silver-grey, slightly-arching, slightly-wavy, lanceolate foliage with distinctly small firm spines on deeply-scalloped margins. Leaves develop greyed purple markings with strong ultraviolet light with reddish purple base. Plants are useful for landscaping as specimens or en masse or as container plants in the landscape or in the home.