John Quincy Adams II (September 22, 1833 – August 14, 1894) was an American lawyer and politician, the son of Charles Francis Adams (1807-1886) and the grandson and namesake of president John Quincy Adams.
Adams graduated from Harvard University in 1853, practiced law, and then established an experimental model farm near Quincy, Massachusetts. He married Frances (Fanny) Cadwalader Crowninshield, daughter of George and Harriet Sears Crowninshield of the politically powerful Crowninshield family.
Adams was elected to the Massachusetts state legislature in 1866 as a Republican, but soon switched to the Democratic Party because of his disaffection with president Andrew Johnson's Reconstruction policies. He was nominated for Governor of Massachusetts in 1868, 1869, and 1870, but was never elected.
Adams received one vote for the Democratic nomination for President of the United States at the 1868 Democratic National Convention.  It is often claimed that in 1872 he was nominated for vice-president, along with Charles O'Conor for president, by the faction of Democrats that refused to support Horace Greeley, but in fact it was his father Charles Francis Adams who ran on this ticket. After losing an election for lieutenant-governor in 1876, Adams refused most further involvement in politics, including an offer of a cabinet position from Grover Cleveland in 1892.