Caesalpinia echinata is a species of Brazilian timber tree in the pea family, Fabaceae. Common names include Brazilwood, Pau-Brasil, Pau de Pernambuco, Nicaragua wood and Ibirapitanga (Tupi). This plant has a dense, orange-red heartwood that takes a high shine, and it is the premier wood used for making bows for stringed instruments. The wood also yields a red dye called brazilin, which oxidizes to brazilein.

When Portuguese explorers found these trees on the coast of South America, they used the name pau-brasil to describe them. Pau is Portuguese for "stick" (or, by metonymy, "wood" in general), and brasil is said to have come from brasa, Portuguese for "ember", meaning "emberlike". The wood of this tree has a deep red hue, which may be why it received this name. Pau-brasil had been earlier used to describe a different species of tree found in Asia and other places, called Sappanwood which also produced red dye; but the South American trees soon became the better source of red dye. Brazilwood trees were such a large part of the exports and economy of the land that the country which sprang up in that part of the world took its name from them and is now called Brazil.