Kummer may refer to:
- Benno Kummer (de) (1924 – 2007), German doctor
- Bernhard Kummer (1897−1962), German Germanist
- Carl Robert Kummer (de) (1810 – 1889), German painter
- Caspar Kummer (de) (1795 – 1870), German fluetist, composer
- Christa Kummer (de) (born 1964), Austrian female TV presenter
- Dirk Kummer (de) (born 1966), German actor, playwright
- Eberhard Kummer (de) (born 1940), Austrian singer
- Eduard Kummer
- Ernst Eduard Kummer (1810 - 1893), German mathematician
- Kummer's function, one of two functions named for Ernst Kummer
- Ferdinand Kummer (1820 - 1870), taxonomist
- Ferdinand von Kummer (de) (1816 – 1900), Prussian general
- Friedrich August Kummer (1797 - 1879), German cellist and composer
- Karl Kummer (1904 – 1967), Austrian politician
- Lilian Kummer (born 1975), Swiss female skier
- Maria Gottliebin Kummer (de), known as "Kummerin" (1756 – 1828)
- Mario Kummer (born 1962), German cyclist
- Oskar Ludwig Kummer (de), aka "O. L. Kummer" (1848 – 1912), German tram manufacturer (Dresden)
- Paul Kummer (1834 – 1912), priest, taxonomist of Zerbst
- Patrizia Kummer (de) (born 1987), Swiss female snowboarder
- Roy Kummer (de) (born 1966), German writer and journalist
- Siegfried Adolf Kummer (1899 - ?), mysticist
- Stefan Kummer (de) (born 1947), German art historian
- Tilo Kummer (de) (born 1968), German politician of Thuringia (Die Linke)
- Tom Kummer (de) (born 1963), Swiss journalist
- Uta Kummer (born 1966), German politician of Bremen (SPD)
- Wolfgang Kummer (bobsleigh), German bobsledder who competed in the 1936 Winter Olympics
- Wolfgang Kummer (physicist) (1935 – 2007), Austrian physicist