Eucalyptus stenostoma, the Jillaga ash is a rarely seen eucalyptus tree of eastern Australia. It grows in remote forests on the tablelands of south eastern New South Wales. Eucalyptus stenostoma is a small to mid-sized tree, usually 10 to 20 metres tall, often with a leaning trunk. The tallest are around 25 metres. The original specimen was collected by D.J. Hynd. in July 1965. Located north west of Nerrigundah at the head of the Tuross River, elevation 865 metres, parish of Jilliga, county of Dampier. The specific epithet is from the Greek stenos, narrow, referring to the narrow stoma on the leaves.