Thomas H. Stack SJ (July 3, 1845 – August 30, 1887) was an American Catholic priest and Jesuit who served briefly as the president of Boston College in 1887.

After the outbreak of the Civil War, he enlisted in the Confederate States Army in 1863, serving as an artilleryman and then in the signal corps until 1865.

He enrolled in the Virginia Military Institute, but his studies were halted due to the outbreak of the Civil War in 1861,[1] and Stack enlisted in the Confederate States Army on December 16, 1863.

He decided to enroll at Georgetown after hearing its president, Bernard A. Maguire, preach in Virginia.

[6] During his presidency, he also served as pastor of the Church of the Immaculate Conception in the South End of Boston.