Francis "Frank" John King (1838-1903) was a Union soldier in the 13th Pennsylvania Reserve Regiment or "Bucktails," led by Thomas L. Kane.

Francis John King, known as Frank King, was born on January 26, 1838, in Sudbury, England to William King and Eliza Kewell. He married Martha King Bell and they had one son. During the Civil War, King joined the 13th Pennsylvania Reserve Regiment, known as "Kane's Rifles" or simply the "Bucktails," in 1861 until the regiment was mustered out of service on June 11, 1864. This regiment was lead by Thomas L. Kane and fought in several major battles, including Antietam, Fredericksburg, and Gettysburg. He was later sent to the 190th Pennsylvania Regiment. King was captured and spent the remainder of the war at Salisbury Prison Camp, North Carolina. After the war he worked for the Findlay Oil Refining Company in Ohio. Francis John King died on January 28, 1903, in Washington D.C.

Martha King Bell (1832-1921) was married to Francis John King.

Martha King Bell was born on March 3, 1832, in Kings Run, Pennsylvania, to William Bell and Martha King. She married Francis John King, and had one son together. Martha King Bell died on November 21, 1921, at Kings Run, Pennsylvania.