Amaranthus dubius, the red spinach, Chinese spinach, (simplified Chinese: 苋菜; traditional Chinese: 莧菜; pinyin: xiàncài), spleen amaranth, hon-toi-moi, yin choy, hsien tsai, or Arai keerai (அரைக்கீரை) is a plant species. It belongs to the economically important family Amaranthaceae.

This plant is native to South America, Mexico, and the West Indies, however; it is widely introduced throughout the world. The species occurs locally in France and Germany and is naturalized or invasive in tropical and subtropical regions of the United States (Florida and Hawaii), Africa, Asia, Australia and the Pacific.