Mayor Zohran Mamdani took advantage of his taxpayer-funded housing to film a slick campaign video for a lefty candidate in a contentious New York congressional race — sparking backlash from critics who said it could run afoul of conflict of interest laws.

Hizzoner, in the social media clip released Thursday, could be seen palling around with Parkland survivor David Hogg at Gracie Mansion.

The mayor and Hogg, of the group, Leaders We Deserve, solicitated donations for Democratic Socialists of America member Claire Valdez, who is running for New York’s 7th House District seat.

Councilman Phil Wong’s office told The Post the lawmaker was planning to file a complaint with the city’s Conflict of Interest Board over the video.

One Democratic operative called it “unseemly,” but said they weren’t sure if it actually crossed a legal line.

“[If] Eric Adams had done it; they would have a f–king aneurysm,” the source griped.

One staffer of the former mayor’s fumed that the video was “typical DSA bulls–t.”

“Rules for thee but not for me,” said ex-Adams staffer Menashe Shapiro, charging of Mamdani: “He’s turning the entirety of city government into a DSA propaganda tool.”

Last year, Councilwoman Joann Ariola (R-Queens) was dinged by the COIB for using City Council letterhead when fundraising for then-GOP nominee for mayor, Curtis Sliwa.

“The press release contained the seal of the City Council, a City resource that cannot be used for political endorsements,” the board wrote.

Ariola paid $2,000 to settle the foul.

“I got dinged for a violation for using a Council Seal in a statement regarding a candidate, but this guy is out here using Gracie Mansion for a campaign shoot and nobody seems to care,” Ariola fumed.

“It seems the old saying, ‘Rules for thee and not for me’ is still holding true. Where is COIB on this?”

Calls to City Hall and Valdez’s campaign were not immediately returned.