Nothofagus cliffortioides, commonly called mountain beech (Māori: tawhai rauriki), is a species of Southern beech tree and is endemic to New Zealand.

In New Zealand the taxon is called Fuscospora cliffortioides.

[3][4] Nothofagus cliffortioides occupies a wider range of habitat than any other New Zealand tree species and it shows a corresponding range of life form, seeding habits, regenerative patterns, growth habits, growth rates, stand replacement and mortality patterns.

[5] Mountain beech grows to around 20 metres (66 ft)[6] but near the treeline forms a "goblin forest" where the trees are no more than 2 m (6 ft 7 in) tall.

Mountain beech is eaten by the mountain beech flat moth (Proteodes carnifex), and is a host plant for the lichens Yarrumia colensoi and Podostictina degelii, and the fungi Annulohypoxylon bovei Rossbeevera pachydermis.