James Hadley (March 30, 1821 – November 14, 1872) was an American philologist who taught Greek and Hebrew languages at Yale College.

[2] Hadley received his early instruction at the Fairfield Academy, and also acquired some scientific knowledge from his father.

[2][4] Hadley's most original written work was an essay on Greek accent, published in a German version in Georg Curtius's Sprachvergleichende Beiträge zur griechischen und lateinischen Grammatik.

Woolsey) and his Essays, Philological and Critical (twenty altogether; New York, edited by William D. Whitney) were published.

At the beginning of the American Civil War, Henry was prevented by his friends from enlisting in the Union Army, but paid for two substitutes.

During the summer vacation of 1864, he offered his time for the work of the United States Sanitary Commission, and was sent to City Point, Virginia, where he died.