Myriophyllum variifolium is a species of water milfoil native to eastern Australia where it grows in aquatic habitat such as ponds and streams.

[1] Joseph Dalton Hooker described the species in 1840, from material collected in the Lachlan River,[2] as well as Tasmania.

It grows in shallow still or slowly-moving water 30 to 2 m (98.4 to 6.6 ft) deep[3] An aquatic herbaceous plant, M. variifolium grows to about 50 cm (20 in) in length, its smooth stems around 0.5 cm (0.20 in) in diameter.

[4] Myriophyllum variifolium intergrades with the very similar M. simulans in western Victoria and South Australia.

[5] Myriophyllum variifolium can be distinguished from M. simulans by its fruit—the former has yellowish brown cylindrical fruit around 1.5 mm long, while the latter has reddish purple oval fruit around 1 mm long.