Dr. Louis Pasteur was a famous 19th century French medical doctor from Paris. (DS9: "Distant Voices")
In the mid 23rd century, Dr. Roger Korby was described as the "Louis Pasteur of archaeological medicine." (TOS: "What Are Little Girls Made Of?")
For Dr. Julian Bashir's surprise birthday party in 2371, the crew of Deep Space 9 had the choices narrowed down to two different holosuite programs: a Greek palace on Mount Olympus or Louis Pasteur's house in Paris. (DS9: "Distant Voices")
The USS Pasteur was presumably named after him. (TNG: "All Good Things...")
- Although it was stated in many episodes, including Distant Voices, that Louis Pasteur was a physician, he was in fact a chemist and microbiologist who was for a short time also a professor of physics. He did not have and never claimed to have a medical degree.