Eucalyptus diptera, commonly known as the two-winged gimlet, is a mallet that is endemic to the south-west of Western Australia. It has smooth greenish to brownish bark, linear to lance-shaped adult leaves, flower buds in groups of three, each with two wings along the sides, creamy white to pale lemon-coloured flowers and cup-shaped to hemispherical fruit, also with two wings on the sides.