Albert D. J. Cashier (December 25, 1843 – October 11, 1915) was an Irish-born American soldier who served in the Union Army during the American Civil War. Cashier became famous as one of at least 250 soldiers who were assigned female at birth and enlisted as men to fight in the Civil War. He adopted the identity of a man before enlisting, and maintained it until death. The consistent and nearly lifelong (at least 53 years) commitment to a male identity has prompted some historians to believe that Cashier was a trans man.

According to a later investigation by the administrator of Cashier's estate, Albert Cashier was born Jennie Irene Hodgers in Clogherhead, County Louth, Ireland, on December 25, 1843, to Sallie and Patrick Hodgers. Typically, his uncle or stepfather was said to have dressed him in male clothing so he could work in an all-male shoe factory in Illinois. Even before the advent of the war, he adopted the identity of Albert Cashier in order to live independently. Sallie Hodgers, Cashier's mother, was known to have died prior to 1862, by which time Cashier had traveled as a stowaway to Belvidere, Illinois, and was working as a farmhand to a man named Avery.

Cashier was elderly and suffering from dementia when he was interviewed about immigrating to the United States and enlisting in the army, and had always been evasive about early life; therefore, the available narratives about his early life are often contradictory.

Cashier first enlisted August 6, 1862, he enlisted in the 95th Illinois Infantry for a three-year term using the name "Albert D.J. Cashier" and was assigned to Company G. The Company Descriptive Book of the 95th shows the entry for Cashier, a 5'3" soldier, nineteen years old with blue eyes and auburn hair, weighing 110 pounds. Cashier easily passed the medical examination because it consisted of showing one's hands and feet. During the Civil War, many soldiers were young boys. He could not read or write and instead marked an X on the enlistment papers. His fellow soldiers recalled that he was reserved and preferred not to share a tent.

Many soldiers from Belvidere participated in the Battle of Shiloh as members of the Fifteenth Illinois Volunteers, where the Union had suffered heavy losses. Cashier took the train with others from Belvidere to Rockford in order to answer to the call for more soldiers. Along with others from Boone and McHenry counties, Cashier was trained to be an infantryman of the 95th Regiment at Camp Fuller in Rockford. After being shipped out by steamer and rail to Confederate strongholds in Columbus, Kentucky and Jackson, Tennessee, the 95th was ordered to Grand Junction where the regiment became part of the Army of the Tennessee under General Ulysses S. Grant.

The regiment was part of the Army of the Tennessee under Ulysses S. Grant and fought in approximately forty battles, including the Siege of Vicksburg. During this campaign, Cashier was captured while performing reconnaissance, but managed to escape and return to the regiment. In June 1863, still during the siege, he contracted chronic diarrhea and entered a military hospital, where his birth sex remained undiscovered.

In the second quarter of 1864, the regiment was also present at the Red River Campaign under General Nathaniel Banks, and in June 1864 at the Battle of Brice's Crossroads in Guntown, Mississippi, where they suffered heavy casualties.

Following a period to recuperate and regroup following the debacle at Brice, the 95th, now a seasoned and battle-hardened regiment, saw additional action in late 1864 through early 1865 in the Franklin–Nashville Campaign, at the battles of Spring Hill and Franklin, the defense of Nashville, and the pursuit of General Hood.