John Rutledge Bermingham (November 7, 1923 – May 29, 2020) was an American politician and lawyer who served in the Colorado Senate from 1965 to 1973 as a Republican.
Bermingham attended Yale University and Columbia Law School, graduating from the latter in 1949.
He sponsored legislation with future governor Richard Lamm that made Colorado the first state to liberalize its abortion laws.
After serving in the Colorado Legislature, he was a board member of the Rocky Mountain Center of the Environment.
While in his 80s, Bermingham taught courses at the University of Denver on population sustainability.