Outside the courthouse, a crowd of several hundred people erupted in cheers when the verdict was announced.
Chants of "George Floyd," and "All three counts!" broke out.
The 12-member jury found Chauvin, 45, criminally liable in Floyd's death last year after considering three weeks of testimony from 45 witnesses, including bystanders, police officials and medical experts. Deliberations began on Monday and lasted just over 10 hours.
In a confrontation captured on video, Chauvin, who is white, pushed his knee into the neck of Floyd, a 46-year-old Black man in handcuffs, for more than nine minutes on May 25, 2020, as he and three fellow officers arrested Floyd, who was accused of using a fake $20 bill to buy cigarettes at a grocery store.
Chauvin had pleaded not guilty to the charges of second-degree unintentional murder involving "intentional infliction of bodily harm," third-degree unintentional "depraved mind" murder involving an "act eminently dangerous to others," and second-degree manslaughter involving a death caused by "culpable negligence."