Witmer may refer to:
Witmer, Pennsylvania, a census-designated place Witmer Lake, a lake in Indiana
People with the given name Witmer Stone (1866–1939), American ornithologist, botanist, and mammalogist
People with the surname Charles B. Witmer (1862–1925), U.S. federal judge Denison Witmer, American songwriter Elizabeth Witmer (born 1946), Canadian politician Jill Witmer (born 1991), American field hockey player John Witmer (1951–2004), Canadian musician Lawrence Witmer (born 1959), American paleontologist and paleobiologist Lightner Witmer (1867–1956), American psychologist Tamara Witmer (born 1984), American model and actor
See also Witmer v. United States, a 1955 Supreme Court case Whitmer (disambiguation) Wittmar, Lower Saxony, Germany Wittmer, a surname