Frankl is a surname. Notable people with the surname include:
Ludwig August von Frankl (1810–1894), Austrian writer and philanthropist
Paul Frankl (1878–1962), German art historian
Paul T. Frankl (1886–1958)
Paulette Frankl, American courtroom artist
Peter Frankl (born 1935), British pianist
Péter Frankl (born 1953), Hungarian mathematician
Viktor Frankl (1905–1997), Austrian psychiatrist and neurologist; founder of Logotherapy
Wilhelm Frankl (1893–1917), German military aviator