The surname Lanman may refer to:
- Charles Lanman (1819–1895), librarian and explorer
- Charles Rockwell Lanman (1850–1941), Harvard University professor, scholar of Sanskrit and editor of the Harvard Oriental Series
- Faith Lanman Gorrell (1881-1966), American home economist, college professor
- Fritz Lanman (1981–present), American entrepreneur and investor
- James Lanman (1767–1841), American lawyer and United States Senator
- James Lanman (musician) American singer-songwriter
- Dr. Richard B. Lanman (1955–present), American physician-scientist and historical ecologist
- Colonel William K. Lanman Jr. (1904–2001), aviator and benefactor of Yale University