Lounsbury, also written Lounsbery or Lounsberry is a surname, and may refer to any one of the following:
- Ebenezer Lounsbery (c. 1787–1868), New York politician
- Floyd Lounsbury (1914-1998), American linguist and anthropologist
- George E. Lounsbury (1838-1904), Governor of Connecticut
- Hewitt Lounsbury (ca. 1911–1971), Mayor of Anchorage, Alaska
- Jim Lounsbury (1923–2006), American musician
- John Lounsbery (1911-1976), American cartoon animator
- Michael Lounsbury (born 1966), American organizational theorist
- Phineas C. Lounsbury (1841-1925), Governor of Connecticut
- Richard Lounsbery (1882–1967)
- Robert H. Lounsberry (1918–2001), Iowa politician
- Thomas Lounsbury (1838–1915), American literary historian and critic
- William Lounsbery (1831-1905), U.S. Congressman from New York