Daisy Miller A young, exceptionally pretty, young lady from the United States who shocks the more formalized European society by her spontaneous acts.
Mrs. Miller Daisy's mother, who seems to sanction most of Daisy's erratic actions.
Winterborne The narrator of the story and an acquaintance of Daisy Miller.
Mrs. Costello Winterborne's aunt, who acts as his confidante; she thoroughly disapproves of Daisy Miller.
Mrs. Walker A mutual friend of both Winterborne and Daisy Miller who later severs her relationship with Daisy.
Mr. Giovanelli A handsome young Italian whom Daisy picks up in Rome.