糖苷配基（英语：Aglycone）是糖苷分子中的非糖体部分，是配糖类化合物通过氢原子移除糖基后的剩余物质。按照糖苷配基的种类，可以分为烷基糖苷、芳香糖苷、双萜糖苷及三萜糖苷等。

An aglycone, or aglycon, is the compound remaining after the glycosyl group on a glycoside is replaced by a hydrogen atom.

For example, the aglycone of a cardiac glycoside would be a steroid molecule.

Classes of phytochemicals found in the aglycone and glycosides forms :