Pleodorina is a genus of colonial green algae in the family Volvocaceae.

Colonies always motile; spherical to sub-spherical, with 32-128 cells lying some distance from one another just within the periphery of the homogeneous, hyaline, gelatinous, colonial envelope and not connected by cytoplasmic strands.

Cells differentiated into those that are purely vegetative in character and those capable of dividing to form daughter colonies.

Vegetative cells with a cup-shaped chloroplast containing one pyrenoid; a large anterior eyespot; two cilia of equal length with two contractile vacuoles at their base.

The eyespot and cilia of reproductive cells disappearing when they are mature.The young colonies of Pleodorina look very much like those of Eudorina (Smith, 1920, p 97.