Cubitt is a surname, and may refer to:
- Bertram Cubitt KCB (1862–1942), civil servant in the British War Office
- Clayton James Cubitt, a.k.a. SIEGE, American art photographer
- David Cubitt, Canadian television actor
- Eleni Cubitt, film maker born in Greece
- George Cubitt, 1st Baron Ashcombe (1828–1917), British politician, the son of architect Thomas Cubitt
- Henry Cubitt, 2nd Baron Ashcombe CB, TD (1867–1947), politician in the United Kingdom
- Henry Cubitt, 4th Baron Ashcombe, (1924–2013), British peer
- Henry Cubitt Gooch (1871–1959), British barrister, educationalist and Conservative politician
- Hilton Cubitt, key character in The Adventure of the Dancing Men, a Sherlock Holmes short story by Sir Arthur Conan Doyle
- James Cubitt (1836–1912), architect of non-conformist chapels
- Joseph Cubitt, English civil engineer
- Les Cubitt (1893–1968), Australian representative rugby league player
- Lewis Cubitt (1799–1883), English civil engineer
- Mordecai Cubitt Cooke (1825–1914), English botanist and mycologist
- Roland Cubitt, 3rd Baron Ashcombe (1899–1962), British peer
- Rosalind Maud Cubitt, wife of Bruce Shand, an officer in the British Army
- Sonia Cubitt, Baroness Ashcombe OBE DStJ (1900–1986), the daughter of Hon. George Keppel and his wife Alice
- Thomas Cubitt (1788–1855), master builder in London
- Thomas Cubitt KCB CMG DSO (1871–1939), British Army officer of the late 19th and early 20th centuries
- William Cubitt (1785–1861), eminent English civil engineer and millwright
- William Cubitt CBE, British Army general commanding London District
- William Cubitt (politician) (1791–1863), English engineering contractor and politician
- William George Cubitt VC DSO (1835–1903), English recipient of the Victoria Cross
