Denning can refer to any of the following:
Places
- Denning (lunar crater), a crater located on the far side of the moon
- Denning (Martian crater), a crater on Mars
- Denning (Munich), a district of Munich, Germany
- Denning, New York, a town in Ulster County, New York, US
- Denning, Arkansas, a town in Franklin County, Arkansas, US
People
- Alfred Denning, Baron Denning (1899–1999), British lawyer and judge
- Chris Denning (born 1941), British-Slovak disc jockey
- Dorothy E. Denning (born 1945), American information security researcher
- Norman Denning (1904–1979), British officer of the Royal Navy and brother of Alfred Denning
- Peter J. Denning (born 1942), American computer scientist
- Richard Denning (1914–1998), American actor
- Richard J Denning (born 1967), British author
- Robert Denning (1927–2005), American socialite and interior designer
- Scott Denning, American atmospheric scientist
- Troy Denning (born 1958), American writer
- William A. Denning (1817–1856) American jurist and politician
- William Frederick Denning (1848–1931), British amateur astronomer
Other
- Denning, a form of hibernation
- Denning Manufacturing Australian bus manufacturer
See also
- Dening (disambiguation)
- Dunning