Gracilinanus is a genus of opossum in the Didelphidae family. It was separated from the genus Marmosa in 1989, and has since had the genus Cryptonanus removed from it. It contains the following species:

• Aceramarca Gracile Opossum (Gracilinanus aceramarcae)
• Agile Gracile Opossum (Gracilinanus agilis)
• Wood Sprite Gracile Opossum (Gracilinanus dryas)
• Emilia's Gracile Opossum (Gracilinanus emilae)
• Northern Gracile Opossum (Gracilinanus marica)
• Brazilian Gracile Opossum (Gracilinanus microtarsus)

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