Leucanthemum maximum is a species of flowering plant in the aster family known by the common name max chrysanthemum.

It is native to France and Spain but it can be found growing wild in other parts of the world as an introduced species and sometimes a garden escapee.

It is a rhizomatous perennial herb growing 30 to 70 centimeters tall with many large serrated leaves around the base of the stem on winged petioles.

The inflorescence is generally a large, solitary flower head which may exceed 8 centimeters in diameter.

This species is one of the wild chrysanthemums Luther Burbank crossed to produce the popular garden hybrid known as the Shasta daisy, Leucanthemum × superbum.