Ninnis may refer to:

• Ninnis Glacier
  • Mertz-Ninnis Valley
• Belgrave Edward Sutton Ninnis (1887–1912), British Army officer and Antarctic explorer
• Belgrave Ninnis (1837–1922), Royal Navy surgeon, pioneer of Northern Australia, surveyor, Arctic explorer, and Freemason
• Scott Ninnis (born 1965), Australian basketball player

• Ninni, a given name

This disambiguation page lists articles associated with the title Ninnis.
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