- Rowland Mallet a wealthy Bostonian bachelor and art connoisseur.
- Cecilia, Rowland's cousin. She is the widow of a nephew of Rowland's father. She has lost her fortune and lives in Northampton, Massachusetts.
- Roderick Hudson, a law student in Northampton, Massachusetts, sculptor by hobby.
- Mrs. Hudson, Roderick's mother.
- Stephen Hudson, Roderick's brother. Died in the U.S. Civil War and is only mentioned a few times in the novel.
- Miss Mary Garland a distant poor cousin of the Hudsons who has been living with them as a companion to Mrs. Hudson. Mallet finds himself unexpectedly attracted to the young woman—to her simplicity, her lack of affectation, and her honesty.
- Mr. Striker, an attorney who lent books to Roderick when he was studying law.
- Mrs. Striker, Mr. Striker's wife.
- Miss Petronilla Striker, the Strikers' daughter.
- Mrs. Light, Christina Light's mother.
- Miss Christina Light, later the Princess Casamassima. A beautiful American woman with whom Roderick Hudson falls in love.
- The Cavaliere, Mrs. Light's companion, a somewhat mysterious Italian.
- Gloriani, an Italian sculptor whose work Roderick despises. He is in his forties.
- Sam Singleton, an American painter and a friend of Roderick's.
- Miss Augusta Blanchard, a friend of Roderick's. She is American, young and pretty.
- Madame Grandoni, Miss Blanchard's neighbour.
- Prince Casamassima, a rich Neapolitan.
- Mr. Leavenworth, a gentleman who made money in Midwestern borax mines. He is a friend of Miss Blanchard's.
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