Amblymelanoplia thomsoni is a species of beetle of the family Scarabaeidae. It is found in South Africa (Western Cape).
Adults reach a length of about . They are mostly dull black, with the legs dark red-brown. The clypeus and the head have black setae. The pronotum has brown setae and black setae on the anterior and lateral margins. The elytra have brown setae.
The species is dedicated to the American entomologist Mr James Livingston Thomson.