Jenness is a surname. Notable people with the surname include:
Benning W. Jenness (1806–1879), United States senator from New Hampshire Diamond Jenness (1886–1969), New Zealand-born Canadian anthropologist and explorer James M. Jenness (born 1946), American businessman John H. Jenness (1862–1915), American politician and physician Linda Jenness (born 1941), American politician Mia Sinclair Jenness (born 2005), American theater actress Morgan Jenness, American freelance dramaturg Stephen Jenness (born 1990), American field hockey player Theodora R. Jenness (1847–1935), American author, editor, missionary Valerie Jenness (born 1963), American academic
See also Jenness Farm, historic farm property in Rochester, New Hampshire Jenness Pond, water body in New Hampshire Jenness State Beach, state park in Rye, New Hampshire