Seminary Ridge is a dendritic ridge that served as an area of military engagements during the Battle of Gettysburg, the bloodiest battle of the American Civil War, which was fought between July 1 and July 3, 1863 in and around Gettysburg, Pennsylvania. Seminary Ridge also served as a military installation during World War II.

Seminary Ridge was the site of Battle of Gettysburg fighting on July 1, 1863, and the Pitzer Woods engagement on July 2. Robert E. Lee established his headquarters on the ridge just north of the Chambersburg pike, and the ridge also served as the Confederate line of battle for July 2 and 3 attacks against Union Army positions on Cemetery Ridge. On July 3, 500 men in George Pickett's division were killed or wounded on Seminary Ridge, including 88 lost in one regiment of Kemper's Brigade from the Federal artillery counterfire prior to Pickett's Charge.  134–6  The last hospital patient of the seminary's Old Dorm left on September 16, 1863.

During a ghost tour up at seminary ridge, a couple of people witnessed a Union soldier step out from behind a tree and watch them while the tour was going on. When the tour was over, a couple walked over to where the soldier was to talk to him, thinking it was a person dressed up and a part of the tour, the soldier stepped back behind the tree and disappeared. This was witnessed by several people.