A new and unique Agave plant named ‘;Royal Flush’; characterized by rigid narrow foliage that points upwardly and curves slightly inwardly toward apex. Leaves have slightly curly filifers in place of marginal teeth. Leaves are variegated with creamy yellow margins, sharply contrasting deep-green leaf centers and a faint minty green between the margin and center. The plant is useful in the landscape as a specimen, en masse, or also in a container in the home or landscape.