"This Is Me" is a song performed by Keala Settle for the film The Greatest Showman. It was released on October 26, 2017, by Atlantic Records as a promotional single from The Greatest Showman: Original Motion Picture Soundtrack and the official lead single on December 8, 2017. It won a Golden Globe Award for Best Original Song at the 75th Golden Globe Awards and was nominated for an Academy Award for Best Original Song at the 90th Academy Awards. A second version, performed by American singer Kesha, was released on December 22, 2017.

Based on this passage, who sings the greatest showman this is me? Let's think fast. Stream of consciousness:
The relevant information to answer the above question is: "This Is Me" is a song performed by Keala Settle for the film The Greatest Showman. So the final answer is Keala Settle.