Alexander Hamilton Bullock (March 2, 1816 – January 17, 1882) was an American lawyer, politician, and businessman from Massachusetts.

He was actively opposed to the expansion of slavery before the American Civil War, playing a major role in the New England Emigrant Aid Society, founded in 1855 to settle the Kansas Territory with abolitionists.

Bullock was educated as a lawyer, and married into the wealthy Hazard family of arms manufacturers, becoming one of the state's wealthiest men.

He served as a military assistant to John Davis, who was Governor of Massachusetts that year, after which he was frequently referred to as "Colonel Bullock".

[7] Elvira's father was owner of a major munitions factory, and upon his death in 1868 the Bullocks inherited a significant fortune, becoming one of the wealthiest families in the state.

[8] Bullock was first elected to the Massachusetts House of Representatives as a Whig in 1844, serving until 1848; for two years he was chairman of the Judiciary Committee.

[20] Bullock received the Republican Party nomination for governor in 1865 after John A. Andrew decided not to stand for reelection.

[22] Bullock was an outspoken advocate of women's suffrage, although the more conservative legislature never enacted enabling legislation.

[25] One of the more contentious issues during Bullock's tenure was the state's alcohol prohibition law, which had been enacted in the 1850s, and which politically divided the otherwise dominant Republicans.

Bullock, in contrast to the laissez-faire approach of Andrew before him, enforced the prohibition law more strictly than any other governor of the period.

Bullock's mentor Francis Bird worked behind the scenes to secure the nomination instead for William Claflin, who went on to win the election.