Robert Grant (January 24, 1852 – May 19, 1940) was an American writer and a jurist who participated in a review of the Sacco and Vanzetti trial a few weeks before their executions.

His output continued with The Undercurrent (1904); The Orchid (1905), an examination of the impact of divorce in the upper class; The Chippendales (1909), the story of the decline in character of a Boston family over the course of several generations; The High Priestess (1915), detailing a woman's struggle to have a career; and The Bishop's Granddaughter (1925), a humorous view and critique of American divorce law.

[7] Some criticized Grant's appointment to the Committee, with one defense lawyer saying he "had a black-tie class concept of life around him," but Harold Laski in a conversation at the time found him "moderate."

[citation needed] The Committee concluded that the trial had been fair, but its report included some measured criticism of the judge in the case, Webster Thayer.

He maintained a particularly acute animus toward Harvard Professor of Law Felix Frankfurter who published an article making the case for the defense in the Atlantic Monthly while appeals were still pending.

Grant believed that Frankfurter's article served as the foundation of most criticism of the Sacco and Vanzetti case on the part of intellectuals throughout the world, a view in which he was seconded by Chief Justice of the Supreme Court William Howard Taft.