Naccariaceae is a family of red algae in the order Bonnemaisoniales, with 3 monotypic genera that are found in both the Pacific and Atlantic Oceans.

But (Hommersand and Fredericq, 1990) said that the similarities in nutritive cells and carpospore germination, noted that the order Bonnemaisoniales was better used instead,[3] Womersley, 1996 agreed.

The structure is uniaxial; axial cells initially ecorticate (without a cortex), but eventually with a cortex, or surrounded by rhizoids (protuberances that extend from the lower epidermal cells) that can be secondarily inflated.

The fertilised zygote generally fusing with the hypogynous cell, then producing a diffuse or discrete gonimoblast lacking a pericarp (ovary wall).

Tetrasporophytes, where known, are microscopic and filamentous, with lateral or terminal tetrahedrally divided tetrasporangia.