Frankl is the surname of:
- Abe Frankl, see Yankee Rose
- Adolf Frankl (1903 - 1983), Jewish Hungarian-Austrian painter
- George Frankl (1921 - 2004), Austrian psychoanalyst and author
- Gerhart Frankl (1901 - 1965), Austrian painter
- Karl Heinz Frankl, Austrian church historian
- Lisl Frank (born: Alice Frankl; 1911, Prague - 1944), a Jewish Czech singer, dancer and actress
- Lothar von Frankl-Hochwart (1862 - 1914), Jewish Czech-Austrian neurologist
- Ludwig August Ritter von Frankl(-Hochwart) (1810, Bohemia - 1893/1894), a Jewish Bohemian-Austrian writer, philanthropist
- Paul Frankl (1878, Prague - 1962, Princeton, New Jersey), Czech-German (Jewish-Christian) architectural historian
- Paul T. Frankl
- Paulette Frankl (born ?, California), an American courtroom artist
- Peter Frankl (born 1935), British pianist
- Péter Frankl, a Jewish Hungarian mathematician
- Viktor Frankl, (1905, Vienna - 1997), Jewish Austrian psychiatrist and neurologist; founder of Logotherapy
- Leutnant Wilhelm Frankl (1893 - 1917)
- Frankl conjecture, in combinatorial mathematics