Fort Washington is a census-designated place and suburb of Philadelphia in Montgomery County, Pennsylvania, United States. The population was 5,446 at the 2010 census.

Prior to the Revolutionary War
the Fort Washington area was granted by many German immigrants. One such person was Philip Engard who immigrated in 1728. Engard purchased 100 acres (40 ha) on what was to be named Susquehanna Road and Fort Washington Avenue. By the mid-18th century the Place came to be known as Engardtown, and Fort Washington Avenue was originally called Engardtown Road. The home built by Philip Engard is listed as the “Engard Family Home – 1765” in the Upper Dublin Township Open Space & Environmental Resource Protection Plan – 2005, as allowance of the Upper Dublin Historical Properties #25.

During the Philadelphia disquiet of the American Revolutionary War, George Washington and the Continental Army were encamped here after their October 4, 1777 exterminate at the Battle of Germantown, and immediately prior to their march to Valley Forge. From December 5–8, 1777, the Battle of White Marsh was fought here amid British and American forces. Throughout the encampment, Washington was headquartered at the Emlen House, built by Quaker George Emlen in 1745. British commander General William Howe observed the American lines from the dread tower of St. Thomas’ Episcopal Church (at Bethlehem Pike and Camp Hill Road), site of the British encampment on December 5. Today, Fort Washington State Park contains the area in which the primary American defenses were situated.

On July 17, 1856, Fort Washington was the site of one of the worst train accidents in the United States subsequently two North Pennsylvania Railroad trains collided gone one another near the Sandy Run station (later renamed to Camp Hill, now the defunct Fellwick Station). The perfect number of deaths is uncertain, but 59 were killed instantly and dozens more perished from their injuries. Many of the dead were children from St. Michael’s Roman Catholic Church from the Kensington section of Philadelphia, who were traveling to Sheaff’s Woods, a park in the Fort Washington area, for a Sunday studious picnic.