Achatinidae (New Latin, from Greek "agate") is a family of medium to large sized tropical land snails, terrestrial pulmonate gastropod mollusks from Africa.

Well known species include Achatina achatina the Giant African Snail, and Lissachatina fulica the Giant East African Snail.

In this family, the number of haploid chromosomes lies between 26 and 30 (according to the values in this table).

[2] The native distribution of Achatinidae is Africa south of the Sahara.

[3] As of 2022, the family Achatinidae contains the following subfamilies:[4] The following genera are recognised in the family Achatinidae:[5] Achatininae Coeliaxinae Cryptelasminae Glessulinae Opeatinae Petriolinae Pyrgininae Rishetiinae Rumininae Stenogyrinae Subulininae Thyrophorellinae Other subfamilies