John Morgan Davis (August 9, 1906 – March 8, 1984) was the 22nd lieutenant governor of Pennsylvania from 1959 to 1963 and later was a United States district judge of the United States District Court for the Eastern District of Pennsylvania.

He was in private practice of law in Philadelphia, Pennsylvania from 1933 to 1952.

He was a judge of the Pennsylvania Court of Common Pleas from 1952 to 1958.

[1] Davis received a recess appointment from President Lyndon B. Johnson on January 7, 1964, to a seat on the United States District Court for the Eastern District of Pennsylvania vacated by Judge Thomas C. Egan.

He assumed senior status due to a certified disability on May 6, 1974.