Geissler or Geißler may refer to:
Persons Ernst Geissler (1915–1989), German and American aerospace engineer Fritz Geißler (1921–1984), German composer Heike Geißler (born 1977), German writer Heiner Geißler (1930–2017), German politician (CDU) Heinrich Geißler (1814–1879), German physicist Ines Geißler (born 1963), German swimmer Jonas Geissler (born 1984) German politician Martin Geissler (born 1971), Scottish news reporter Phillip Geissler (1974–2022), American theoretical chemist Siegfried Geißler (1929–2014), German composer, conductor, hornist and politician Sina-Aline Geißler (born 1965), German writer and journalist William Geissler (1894–1963), Scottish painter
Others Geissler (crater), lunar crater named for Heinrich Geißler Geißler (Lauer), river in Bavaria, Germany Geissler Mountain, mountain in Colorado, US
See also Geisler Geiszler