- Annie P. Miller (Daisy) - A beautiful young American girl. Despite her exact age not being informed, the common sense tells she is about 18 years old.
- Frederick Winterbourne - 27- year-old American gentleman raised in Europe. Lives in Geneva.
- Mrs Costello - Frederick's aunt, a reserved "widow with a fortune".
- Randolph C. Miller - Daisy's 9-year-old electric brother, responsible for introducing her to Frederick.
- Mrs Miller - Daisy and Randolph's mother.
- Eugenio - Miller's courier.
- Mrs Walker - An American lady living in Rome since long. Friend of Daisy and Frederick.
- Giovanelli - Daisy's intimate friend in Rome.
- Ezra B. Miller - The rich husband of Mrs Miller, father of Daisy and Randolph. Mentioned by the latter in the first chapter, he does not appear in the story.
- The 3 sons of Mrs Costello - In chapter 2, the omniscient narrator lets us know that Mrs Costello has 3 sons, two living in America, one in Germany. None of them appear in the story and remain unnamed.
- A friend in the street - In chapter 4, Frederick meets a friend at Via del Corso. This unnamed friend tells him that he had just seen Miss Daisy Miller with a companion at the Palazzo Doria, a famous museum nearby. In hearing this, Frederick heads immediately to see Mrs Miller, who apologies for receiving him in Daisy's absence.
- Dr Davis - Mrs Miller's physician in America (only mentioned).
- Mrs Sanders and Mrs Featherstone - Teachers, considered to support Randolph during the Millers' long term travel through Europe (only mentioned).
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