Antlion, also spelled ant-lion and ant lion, is a name applied to a group of about 2,000 species of insects in the family Myrmeleontidae ("antlions," sometimes misspelled as "Myrmeleonidae"). The most well-known genus is Myrmeleo ("antlion"). Strictly speaking, the term "antlion" applies to the larval form of the members of this family, and several languages have their own terms for the adult. The adults are commonly referred to in English as "antgriffins," or very rarely as "antlion lacewings".

The antlion larva is often called "doodlebug" in North America because of the odd winding, spiralling trails it leaves in the sand while looking for a good location to build its trap, as these trails look like someone has doodled in the sand.