Sajjan Singh is the name of:

• Sajjan Singh of Udaipur (1859–1884), Maharaja of the princely state of Udaipur, 1874–1884
• Sajjan Singh of Ratlam (1880–1912 or 1913), British Indian Army officer and Maharaja of Ratlam State, 1893–1947
• Sajjan Singh (wrestler) (fl. 1960s), Indian Olympic wrestler

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