Ternstroemia washikiatii a new species of Pentaphylacaceae from the Amazonian forests of Eastern Ecuador, is here described and illustrated. It is distinguished from the remaining species in the genus by the large leaves (21–33 × 8.5–11 cm), and the very distinctive large fruits (4.5–5.5 × 6.5–7.7 cm) with six to nine seeds. Ternstroemia washikiatii is assessed as Near Threatened.