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The A.D. Club is a final club established at Harvard University in 1836, the continuation of a chapter of the Alpha Delta Phi fraternity existing as an honorary chapter until 1846, and then as a regular chapter until the late 1850s. At that time, owing to the prevailing sentiment against such societies, it became a strictly secret society, known among its members as the "Haidee," the name of a college boat.

The chapter surrendered its charter in 1865, and has since existed as the A.D. Club.

In 1872, the club rooms were moved from the upper story of a brick house on Palmer Street to a building on Brattle Street. These rooms were occupied until 1878, when a club-house was obtained on the corner of Mt. Auburn and Dunster Streets.

In 1900, the club moved to its present club-house at 1 Plympton St.

In accordance with the present inter-club agreement, sophomores are elected just before Christmas vacation, and "taken in" at the February dinner.

Notable members include:

• Manning Ferguson Force (1846)
• Charles Francis Adams, Jr. (1856)
• Charles Francis Adams, III (1888)
• Charles Francis Adams, IV (1932)
• Robert Bacon (1880)
• Robert Low Bacon (1907)
• William Randolph Hearst (1885)
• Benjamin C. Bradlee (1943)
• Charles W. Eliot (1853)
• Charles Russell Lowell, Jr. (1854)