M. maxima may refer to:
Manilkara maxima, a plant endemic to Brazil Megaceryle maxima, an African kingfisher Megathyrsus maximus, a bunch grass Melanocorypha maxima, an Asian lark Mimusops maxima, an evergreen plant Mordella maxima, a tumbling flower beetle Mordellistena maxima, a tumbling flower beetle Myristica maxima, an Asian plant Myrmecia maxima, an Australian ant