Arnett may refer to:
People:
- Arnett Cobb (1918-1989), American jazz tenor saxophonist
- Benjamin W. Arnett (1838–1906), African American educator, bishop, and elected official
- Jon Arnett (born 1935), American college and National Football League player
- Peter Arnett (born 1934), New Zealand-American journalist
- Ross H. Arnett, Jr. (1919–1999), American entomologist
- Ulysses N. Arnett, Democratic President of the West Virginia Senate from 1877 to 1879
- Will Arnett (born 1970), Canadian actor
Places:
- Arnett, Oklahoma, a town
- Arnett, Braxton County, West Virginia, an unincorporated community
- Arnett, Raleigh County, West Virginia, an unincorporated community