Prosecutors claimed that Fields drove his auto directly into them at the "Unite the Right" rally.
John Hill, Fields' attorney, attempted to argue that he became scared by the violence at the rally, panicked, and drove into the group. His sentencing is expected to begin Monday, and he could be serving life in prison.
In it, Fields said that he was defending himself from "a violent mob of terrorists".
In addition to murder, Fields was convicted of five counts of aggravated malicious wounding, three counts of malicious wounding and a hit-and-run offence.
Sending love to all of my friends in Charlottesville as white supremacist Trump supporter James Alex Fields, Jr is found guilty of First Degree murder and 9 other felonies for deliberately running over Heather Heyer & others with his vehicle.
Prosecutors told the court that Fields attacked the protesters after he witnessed earlier clashes between them and other white nationalists earlier in the day.
During closing arguments Thursday, prosecutor Nina-Alice Antony portrayed Fields as a hateful young man who idled his vehicle for more than a minute before backing up and then speeding into the crowd, killing Heyer and injuring dozens of other people.
The trial featured emotional evidence from survivors who described devastating injuries and long, complicated recoveries.
"Today, we have reclaimed our streets", local activist Rosia Parker proclaimed at a Charlottesville memorial for Heyer, according to The Daily Progress.
Fields lives in OH with his mother.
If convicted of federal hate crimes, Fields is eligible for the death penalty, AP noted. The incident spawned the controversial response from Donald Trump where he claimed that blame could be attributed to both sides, and that there were good and bad people on both the white supremacist side and the opposition. At the time, a group of white nationalists, which included neo-Nazis and Ku Klux Klan members, descended onto Charlottesville, spurred by the city's plans to remove a Confederate statue from a downtown park.
Prosecutors also showed jurors a meme Fields posted on Instagram three months before the rally in which bodies are shown being thrown into the air after a auto hits a crowd of people identified as protesters.
After the verdict was read in court, some of those who were injured embraced Heyer's mother, Susan Bro.
Fields referred to Heyer's mother in a recorded jailhouse phone call as a "communist" and "one of those anti-white supremacists".
Reports coming from the trial note that some of Fields's school teachers remember him being peculiarly fascinated with Nazism and Adolf Hitler. A video of Fields being interrogated after the crash showed him sobbing and hyperventilating after he was told a woman had died and others were seriously injured.