Is Michael Phelps Jewish?

No. Michael Phelps is not a Jew.

Phelps is the all-time Olympic medal winner with 19. Newsday reported on 7/31/2012:

Phelps swam into history with a lot of help from his friends, taking down the last major record that wasn't his alone. He took the anchor leg for the United States in a gold medal-winning performance of the 4x200-meter freestyle relay Tuesday night, earning the 19th Olympic medal of his brilliant career, and the 15th gold.

By winning 8 gold medals at the Olympics in 2008, Phelps eclipsed the record of 7 Olympic gold medals in a single Olympics, set by Mark Spitz in 1972 in Munich. Mark Spitz is considered to be one of the greatest Jewish athletes of all time. Spitz spoke about Phelps in an interview with ESPN.

The efforts of Jason Lezak, a Jewish swimmer on the American team, helped insure that Phelps would indeed win 8 gold medals in the 2008 Olympic games.

Michael Phelps was back in the spotlight in February 2008 because of the publication in News of the World of a photograph of him smoking marijuana.