Deutsch is:

• the German word for German
• a misspelling of the word Dutch
• one of the three cognates of medieval Dietsch

A German family name

• Alexander Nikolaevich Deutsch, Russian astronomer (active 1926-1985)
• Armin Joseph Deutsch, American astronomer (active 1944-1974)
• Alexander Deutsch , German planetologist (active 1984-)
• David Deutsch
• Diana Deutsch: Deutsch's scale illusion, Deutsch's high-low illusion, Deutsch tritone paradox
• Otto Erich Deutsch, who listed all of Schuberts works in a catalogue: by extension Deutsch or D can refer to the catalogue itself, where every composition of Schubert has a separate number. See also: List of compositions by Schubert.