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Mayor Bill de Blasio warned New Yorkers may face $500 fines for violating social distancing rules meant to slow the spread of coronavirus.

“We have seen some non-compliance that is really of concern,” Hizzoner told reporters at his Friday afternoon press conference.

He said penalties could be “up to $500 per incident.”

“I don’t want people to be penalized in a time when there is so much economic distress … but I need people to listen,” de Blasio said. “I’m asking my fellow New Yorkers to take it seriously or else there will have to be more severe measures.”

Brooklyn Councilman Justin Brannan applauded the warning.

“Nobody wants it to come to this, but people still aren’t taking this thing seriously,” Brannan told The Post.

“Folks were asked two weeks to self-regulate, and our parks, playgrounds and sidewalks are still too crowded. This would certainly be a drastic measure, but if people aren’t being smart about this, drastic measures will be necessary,” Brannan said.

Some New Yorkers have flouted the rules by continuing to crowd city parks, basketball courts, groceries and other spots.

De Blasio, however, has said he does not want to close parks or bar exercise. The mayor will make a decision on whether to close playgrounds by Saturday night, he said.

But de Blasio promised hard enforcement against religious gatherings. Violators will be fined and have their buildings shuttered.

“No one wants to see this happen. No one wants to see us every take an action like this, so the word to the wise is just don’t hold services this weekend,” the mayor said.