Leucosolenida is an order of sponges in the class Calcarea and the subclass Calcaronea.

[1] Species in Leucosolenida are calcareous, with a skeleton composed exclusively of free spicules without calcified non-spicular reinforcements.

[2][3] According to Systema Porifera (2002), Lucosolenida contains 9 families, ranging from fully asconoid forms (Leucosoleniidae) to fully leuconoid forms.

These body plans are on a continuum based on an increasingly complex skeletal system and compartmentalized choanocytes.

[3] A few sources (such as the Treatise on Invertebrate Paleontology, 2004) place non-asconoid families into a separate order, Sycettida.