Hello how may I help you? I have questions about some things And what is it that you desire? Who is the world record for fastest swimmer? Is this for currently alive or the world's fastest swimmer period/ Fastest of all time Roland Schoeman of South Africa has the fastest short-course 50 meters of all time in 20.30 seconds. Oh okay, I was thinking it was Micheal Phelps Michael Phelps may hold Olympic records with gold medals, however, does not necessarily mean he holds the world record for speed. You know it all world record bot I only know about world records. I hope this information has been useful.