The jury of six white members and six Black or multiracial ones finished deliberations after about 10 hours over two days.
Chauvin was captured on video on May 25, 2020 kneeling on Floyd's neck for 9 minutes and 29 seconds as he pleaded with the then police officer that he could not breathe but the heartless officers did not budge resulting in his death, which attracted wide condemnation and demonstrations acros America demanding justice.
After the verdict was read from the Minneapolis courthouse, cheers rose from the crowds that had gathered outside and down at the intersection of 38th and Chicago now known as George Floyd Square.
He was taken out of the courtroom in handcuffs and placed in the custody of the Hennepin County Sheriff. Cars honked and chants of "George Floyd" and "All three counts" broke out.
She said Floyd's name is "synonymous with justice and dignity and grace and prayerfulness". "We still have to fight for justice yall", tweeted Questlove. "I'm just very proud of where I live right now".
Mr Floyd's brother, Rodney, said he had tears in his eyes as the jury returned its verdict in the murder trial and he saw Chauvin sent to prison. The crime Floyd was suspected of was using a counterfeit $20 bill. The site has since become a rallying point for racial justice protests.
The speaker and other black lawmakers called for police reform, including the passage of The George Floyd Justice in Policing Act.
Chauvin now faces up to 12 years in prison for the murder conviction but there is a possibility the prosecutors could pursue a maximum penalty of 40 years.
While the USA criminal justice system and juries have long given leeway and some legal protection to police officers who use violence to subdue civilians, the jurors in this case found that Chauvin had crossed the line and used excessive force.
Two of the jurors were in their 20s, three were in their 30s, 40s and 50s and one juror was in her 60s.
"They're a good family, and they're calling for peace and tranquility, no matter what that verdict is".
"This was the right verdict. Justice for Black America is justice for all of America!"
Floyd's death prompted protests against racism and police brutality in many cities in the United States and around the world a year ago.