Diahnne Abbott (born January 1, 1945), sometimes credited Diahnne Eugenia Abbott or Diahnne Déa, is an American actress and singer. Abbott played supporting roles in films of the 1970s and 1980s, including Taxi Driver.

Abbott was married to actor Robert De Niro. They had a son, Raphael, who was named after the hotel in Rome where he was conceived. De Niro adopted Drena, Abbott's daughter from a previous marriage. Drena De Niro has appeared in her father's movies Showtime, Wag the Dog, City by the Sea and The Intern. De Niro and Abbott divorced in 1988.

Abbott has a cameo in the film New York, New York, in which she sings Fats Waller's torch song, "Honeysuckle Rose".

She also played the object of De Niro's affections in Scorsese's 1983 film, The King of Comedy, as well as roles in the television series Crime Story (character of Sonia) and the film Jo Jo Dancer, Your Life Is Calling (Mother). She is the cousin of singer Gregory Abbott, known for his 1986 song "Shake You Down".