Patrick Francis Cassidy (22 March 1915 – 5 January 1990) was a United States Army officer who served in World War II.

While serving as commander of 1st Battalion, 502nd Parachute Infantry Regiment in the Battle of Carentan, Lieutenant Colonel Cassidy was awarded the Distinguished Service Cross.

[3] Major general Cassidy commanded the 8th Infantry Division from April 1966 to June 1968.

[5] Lieutenant general Cassidy served as commander of I Corps from 8 August 1969 to 26 July 1970.

In January 1973, he acted as commander of escorts for the memorial service for former President Harry S. Truman at Washington National Cathedral.