陶粒，又名膨胀粘土、火炼石等，一种质轻有蜂窝状结构的建筑材料，粘土经约1200摄氏度烧制而成。

作为填充物料，陶粒的轻身、耐用、透水及隔热特性意味着它有多元化的应用。陶粒的种类很多，主要有铝钒土陶粒砂，页岩陶粒、粉煤灰陶粒、粉煤灰陶粒等。

陶粒起源于中国，主要用于建筑行业，虽然隔热性能好，较轻，价格相对低廉，但是在建筑行业的效果还没有得到时间的验证。

Lightweight expanded clay aggregate (LECA) or expanded clay (exclay) is a light weight aggregate made by heating clay to around 1,200 °C (2,190 °F) in a rotary kiln. The yielding gases expand the clay by thousands of small bubbles forming during heating producing a honeycomb structure. LECA has an approximately round or potato shape due to circular movement in the kiln, and is available in different sizes and densities. LECA is used to make lightweight concrete products and other uses.