Sumati or Sumathi may refer to:

• Sumathi (actress) (born 1964), popular Tamil actress
• Sumati Kshetramade (1913–1997), Indian Marathi writer
• Sumati Morarjee (1909–1998), Indian shipowner
• Sumathi Murthy, Indian vocalist, composer, and activist
• Sumati Mutatkar (1916–2007), Indian vocalist and musicologist
• Sumati Oraon, Indian politician
• Sumati (astronomer) (6th-10th century AD), Nepali astronomer
• Sumatinatha, 5th Jain Tirthankara
• Sumati (mythology), mother of 60,000 sons of King Sagara in Hindu mythology
• Sumati, also known as Sumedha, a previous life of the Buddha
• Sumati, mother of the Hindu god Kalki
• Sumati, a character in the 2024 Indian sci-fi film Kalki 2898 AD, portrayed by Deepika Padukone
• Sumathi Satakam, a type of Telugu poetry written by Baddena
• Sumathi (1942 film), a Telugu film