Samuel Dennis Warren II (January 25, 1852 – February 18, 1910) was an American lawyer and businessman from Boston, Massachusetts.

[8] Brandeis later acknowledged that the idea for the essay originated with Warren's "deep-seated abhorrance of the invasions of social privacy" on the part of the press.

In 1906, Warren's brothers Edward and Fiske charged that Brandeis had structured the trust to benefit Samuel at the expense of his siblings.

[3] Warren committed suicide by firearm at his Dedham, Massachusetts, country home on the night of February 18, 1910, putting to an end the dispute over the family trust.

[15] The Warren Trust case became a point of contention during the 1916 Senate hearings on the confirmation of Brandeis to the Supreme Court, and it remains important for its explication of legal ethics and professional responsibility.