Ratti may refer to:

• Ratti, traditional Indian unit of mass measurement
• Ratti (surname), Italian surname
• Ratti family, Italian family

• Phthenolphthalein
• Phthia of Epirus
• Phthia of Macedon
• Phthinosuchus
• Phthinthia
• Phthiriasis
• Phthirus infestation
• Phthisis bulbi
• Phthisis pulmonalis
• Phthorimaea operculella
• Phthsis
• P.H. Timberlake
• Phtinosuchus
• Phtisicidae
• Phtisicinae
• Phtisicoidea
• Phtls
• PHTLS
• .phtml
• PHTO
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• Phua Chu Kang episodes (Season 5)
• Phua Chu Kang episodes (Season 6)
• Phua Chu Kang episodes (Season 7)
• Phua Chu Kang episodes (Season 8)