Cnidoscolus aconitifolius, commonly known as chaya, tree spinach, Mayan tree spinach, or spinach tree, is a large, fast-growing and leafy perennial shrub in the spurge family Euphorbiaceae.

The plant is native to Mexico. As with most euphorbias, the plant exudes an irritating, often toxic latex when damaged. The plant is cultivated in warm climates for its leaves that are cooked and eaten like spinach.