Rockland County Executive Ed Day is under fire from critics who claim he’s using coded language to spread hatred against the Jewish population.

“Ed Day makes the Jewish community feel very uncomfortable — he encourages anti-Semitism,” blasted Rabbi Ronnie Greenwald, president of the Jewish Community of Rockland County, made up of about 100 synagogues.

Tensions in the county have been boiling over for years over issues such as funding for public schools. A state-appointed monitor found last November that the Orthodox-run East Ramapo school board favored its own community at the expense of public-school kids.

The controversies have been explored on the “Block the Block Vote” Facebook page — created to challenge “undue political influence” by the Orthodox communities — which was revealed by The Journal News as being maintained by James Foley, a social worker who works for the county’s Mental Health Department.

A source sent The Post a screen grab alleging to show a Feb. 12 message Day posted to the page that linked to a county press release about the planning department’s disapproval of high-density housing in Ramapo, which has seen an explosion in the Orthodox population.

The alleged post is proof Day is “involved and coordinating” posts on the page, the source claimed. “If you have a public employee who has been vitriolic against the Orthodox community in cahoots with the county executive — that’s a scandal statewide.”

But Day told The Post the screen grab is “an absolute forgery” and that he has never posted anything to the page nor had a conversation with Foley.

Meanwhile, in a recent Facebook post on his personal page, Day blasts the “desecration” at a 9/11 memorial at Haverstraw Bay Park after a photo emerged of an Orthodox family standing around as at least one of their kids sits on the “sacred site.”

“You shouldn’t be climbing on a memorial for 3,000 people who died,” said Day, a former NYPD commander.