Leptogorgia sarmentosa is a species of colonial soft coral, a sea fan in the family Gorgoniidae.

Leptogorgia sarmentosa forms a branching, tree-like structure that can grow to a height of 60 cm (24 in).

The colour of the coenenchyme (the thin fleshy external covering) is usually orange but may instead be yellow, white, red or purple.

[3] It typically grows in the depth range 10 to 300 m (33 to 984 ft) on boulders lying on sandy areas of the seabed or on bedrock partially overlaid by soft sediment.

The embryos develop at first in the gastric cavities of the polyps but are liberated as planula larvae which drift with the currents as part of the plankton for several weeks.