Frank Joseph Gaffney (December 18, 1883 – May 25, 1948) was a soldier in the United States Army who received the Medal of Honor for his actions during World War I.

Similarly, Maj. Gen. John F. O'Ryan, commanding officer of the 27th Division, paid Gaffney high honors.

"[2] Gaffney also received the Purple Heart, the British Distinguished Conduct Medal, the French Médaille militaire and Croix de Guerre, the Italian Croce di guerra al merito, the Montenegrin Medal for Military Bravery and the Portuguese Medalha da Cruz de Guerra, Third Class.

[3] Gaffney, who was known as "the second bravest man in the U. S. Army," later lost his left arm in fighting at St. Souplet on October 15, 1918.

Citation: Private First Class Gaffney, an automatic rifleman pushing forward alone with his gun, after all the other members of his squad had been killed, discovered several Germans placing a heavy machinegun in position.