Ada can mean one of the following things:
- Lady Ada Lovelace
- Ada, sister of Charlemagne, for whom the Ada Gospels at Trier were produced.
- Ada programming language
- Ada, a genus of orchids
- Places named Ada:
- Ada, Saskatchewan
- Ada, Michigan
- Ada, Minnesota
- Ada, Ohio
- Ada, Oklahoma
- As an initialism, ADA often refers to
- It is the alternate title of a novel by Vladimir Nabokov called Ada or Ardor: A Family Chronicle (1969).
