John Theodore Koehler (March 14, 1904 – September 23, 1989) was United States Assistant Secretary of the Navy from 1949 to 1951.
After high school, he enrolled at Grove City College and then transferred to Princeton University, where he majored in politics and graduated Phi Beta Kappa in 1926.
From 1934 to 1935, he was Special Assistant to United States Attorney General Homer Stille Cummings.
With the outbreak of World War II, in 1941 Koehler enrolled in the United States Navy as a lieutenant commander.
In 1950, he briefly served as acting chairman of the United States Federal Maritime Board.