Clethra pachyphylla is a tree in the family Clethraceae.

The specific epithet pachyphylla is from the Greek meaning 'thick leaves'.

[2] Clethra pachyphylla grows up to 10 metres (30 ft) tall.

The roundish fruits measure up to 0.3 cm (0.1 in) in diameter.

[2] Clethra pachyphylla is endemic to Malaysian Borneo.