St. Augustine National Cemetery is a United States National Cemetery located in the city of St. Augustine in St. Johns County, Florida. Located on the grounds of the active military installation known as St. Francis Barracks, the state headquarters of the Florida National Guard, it encompasses 1.4 acres (0.57 ha), and as of the end of 2005 had 2,788 interments. Administered by the United States Department of Veterans Affairs, it is currently closed to new interments. It was listed on the National Register of Historic Places in 2016.

The first interment took place in the area of the cemetery in 1828; it was then used as the post cemetery for the St. Francis Barracks. The first burials were soldiers stationed at St. Francis Barracks and veterans of the Indian Wars, including many that were transferred from burial grounds in what was then Seminole-controlled territory.

During the American Civil War, St. Augustine was initially claimed by the Confederacy, but was quickly occupied by Union forces and remained in Union hands for the remainder of the war. After the war, the cemetery was expanded and improved, and in 1881 it became a National Cemetery.

The cemetery also contains the graves of five British Commonwealth servicemen of World War II, a soldier of the Royal Corps of Signals, and four aviation officers of the Royal Naval Volunteer Reserve.

St. Augustine National Cemetery was included in a National Historic Landmark historic district that encompasses the oldest part of the city in 1970.

Brigadier General Martin Davis Hardin

Martin Davis Hardin
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Civil War Union Brigadier General. He was a graduate of US Military Academy, class of 1859. At the start of the Civil War, he was a Lieutenant Colonel in the Pennsylvania Reserves and was promoted Colonel in command of the 12th Pennsylvania Regiment in July 1862. He led the 12th Pennsylvania in actions from the Peninsula to Falmouth and was wounded at Antietam. At the Battle of Gettysburg, July 1863, he commanded his regiment and an artillery battery at Little Round Top. For his service at Gettysburg, he was promoted Brigadier General in October 1863, in command of Fort De Russy. His last service action was as a commander of the 1st Brigade, 3rd Division of the V Corps at the Battle of Cold Harbor, Louisiana, in June 1864.

St. Augustine National Cemetery, while a historic and serene burial ground, is known for its paranormal activity, with reports of orbs, apparitions, and even the ghost of a Civil War soldier smoking a pipe. Visitors and ghost hunters have also reported collecting electronic voice phenomena (EVPs) as well.

Some have claimed to see the ghost of a Civil War soldier walking the grounds, smoking a pipe, and disappearing when approached. Others have described experiencing sudden drops in temperature and a feeling of being watched, intensifying the eerie atmosphere that envelops the site.

Unexplained shadows and orbs have been captured on camera, adding to the eerie atmosphere of the cemetery.

There have also been reports of the shadow of a headless woman, possibly linked to a 1974 decapitation that occurred nearby.