Fröhlich is a German language surname meaning cheerful. Also spelled Froelich, Froehlich, or Frolich, the surname may refer to:
Abraham Emanuel Fröhlich, German evangelist, theologian and writer
Adolf Froelich, Polish inventor, dentist and officer
Albrecht Fröhlich, German Jewish mathematician
Fröhlich Prize, prize of the London Mathematical Society, in memory of Albrecht Fröhlich
Alfred Fröhlich, Austrian-American pharmacologist and neurologist
Danny Frolich, artist from New Orleans famous for designing Mardi Gras art
Charlotta Frölich, Swedish historian and agronomist
Edward Fröhlich Haskell, scientist and philosopher
Eric Froehlich, American professional poker player
Eva Margareta Frölich, Swedish-Latvian visionary writer
Gustav Fröhlich, German actor
Harold E. Froehlich (1923–2007), American engineer who designed deep-diving exploratory submarine
Harold Vernon Froehlich, U.S. congressman from Wisconsin, 1973–1975
Herbert Fröhlich (1905–1991), German-born British physicist
Jack Froehlich, American rocket scientist
Froelich (crater), a crater on the moon named after Jack Froehlich
Jean-Pierre Frohlich, New York City Ballet balletmaster and former soloist
Johannes Frederik Fröhlich (1806–1860), Danish violinist, conductor and composer
John Froelich, American inventor of the first gasoline-powered tractor
Jürg Martin Fröhlich, Swiss mathematician and theoretical physicist
Katharina Fröhlich (1801–1879), German lover of the poet Franz Grillparzer
Linda Fröhlich, German professional basketball player
Paul Frölich, German politician
Paul Froehlich, Illinois politician
Péter Fröhlich, Hungarian fencing master and Olympic coach
Peter Gay (born Peter Joachim Fröhlich), historian
Samuel Heinrich Froehlich (1803–1857), evangelist
USS Elizabeth M. Froelich (SP-380), United States Navy minesweeper in commission from 1917 to 1919