Macleaya, or plume poppy, is a genus of two or three species of flowering plants in the poppy family Papaveraceae, native to Japan (Macleaya cordata) and China (M. cordata and Macleaya microcarpa). They are large rhizomatous herbaceous perennials with palmately lobed, frilly leaves of olive green or grey colour, 25 cm (10 in) long, and tall stems with airy plumes of petal-less, tubular, off-white or cream flowers.

Macleaya is named after the Scottish entomologist Alexander Macleay (1767-1848).

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