Ortmann is a central German family name, which in the Middle Ages stood for the job called "ortman." This was an arbiter who decided in situations where there is a stalemate.
Ortmann is the surname of the following persons:
- Anton Ortmann (1801–1861), Bohemian-Austrian botanist, with the botanical authority abbreviation Ortmann
- Arnold Edward Ortmann (1863–1927), German zoologist and botanist, with the botanical authority abbreviation A.E.Ortmann
- Andreas Ortmann, economist
- Chuck Ortmann (1929-2018), former American football player
- Edwin Ortmann (1941) German author and translator
- Friedhelm Ortmann (born 1927), German director of radio dramas
- Günther Ortmann (1916–2002), German handball player
- Oliver Ortmann (born 1967), German pool billiard player
- Siegbert Ortmann (born 1940), politician in the state of Hesse (CDU)
- Siegfried Ortmann (born 1937), German archer
- Wilfried Ortmann (1924–1994), German actor
Ortmann is also the name of