Surname
- Amy Hennig, video game director and writer
- Amy Hennig (wrestler) (born 1981), an American professional wrestler
- Angela Hennig (born 1981), German professional cyclist
- Arthur Saxon (born Arthur Hennig, 1878–1921), German strongman and circus performer
- Carsten Hennig (born 1976), German football player
- Curt Hennig (1958–2003), American professional wrestler known as "Mr. Perfect"
- Dennis Hennig (1951–1993), Australian pianist
- Edward Hennig (1879–1960), American Olympic gymnast
- Edwin Hennig (1882-1977), German paleontologist
- Gerd Hennig (born 1935), former German soccer referee
- Heike Hennig (born 1966), German dancer, choreographer and theatre director
- Heinz Hennig (1927–2002), German choral conductor
- Joe Hennig (born 1979), American professional wrestler
- Klaus Hennig (born 1949), German judo athlete
- Klaus-Peter Hennig (born 1947), German Olympic discus thrower
- Larry Hennig (fl. 1963-1985, born 1932), American professional wrestler known as "The Axe"
- Mark A. Hennig (born 1965), American horse racing trainer
- Ottfried Hennig (1937–1999), German politician
- Rudolph Hennig previous member of the Legislative Assembly of Alberta
- Shelley Hennig (born 1987), Miss Teen USA 2004, and actress from Days of our Lives
- Todd Hennig (born 1976), American drummer, formerly for the hardcore punk band Death by Stereo, currently belongs to Nations Afire
- Willi Hennig (1913–1976), a German biologist considered the founder of phylogenetic systematics, also known as cladistics
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