John Walker Ryon (March 4, 1825 – March 12, 1901) was a 19th Century American lawyer, Civil War veteran, and politician who served as a Democratic member of the U.S. House of Representatives from Pennsylvania from 1879 to 1881.

From 1850 to 1856, he served as district attorney of Tioga County, Pennsylvania.

During the American Civil War, Ryon assisted with the organization of Company A of the famous Bucktail Regiment, and was then appointed by Governor Andrew Gregg Curtin as paymaster with the rank of major in the reserve corps.

Post-war, he moved to Pottsville, Pennsylvania, and resumed the practice of law.

He served as president of the Pennsylvania National Bank for several years.