Casearia sylvestris, most commonly known as guaçatonga, is a species of flowering plant in the family Salicaceae.

This plant has a very wide distribution, extending from Mexico down to Argentina, throughout the near entirety of Latin America. It grows primarily in the seasonally dry tropical biome but is also common in moist secondary forests and open disturbed areas. Its range spans elevations from 0–2,800 m (0–9,186 ft), reaching heights where cloud forests develop. While it is most abundant in lowland forests, including tropical rainforest and tropical dry forest, it is also found in oak forests and thrives in secondary vegetation.

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