Metridium canum is a species of sea anemone in the family Metridiidae.

M. canum has a cylindrical column of about 10mm diameter, that is wider at the base than it is high when contracted.

Cinclides (specialist pores) are present on the upper part of the column, and there are four or five whorls of crowded tentacles on the oral disc.

Internally, there are forty-five pairs of mesenteries in four cycles radiating from the body wall.

Its typical habitat is sand or mud where it is attached to the undersides of stones.