The Conservative Party on Wednesday endorsed Staten Island GOP Assemblywoman Nicole Malliotakis for mayor.

The unanimous backing of the five county Conservative Party leaders could boost Malliotakis’ late bid to take on Mayor de Blasio, the Democratic incumbent seeking re-election.

But first she has to face off in a Republican primary against real estate executive Paul Massey, who is well financed and has the backing of the Independence Party.

“The Conservative leaders respect Nicole’s capability as an Assembly person. She understands legislation, the law and budgets and how money is wasted in government,” state Conservative Party chairman Mike Long said.

“Nicole is not afraid to take on or debate Bill de Blasio, She took him to court over immigration enforcement.”

Conservatives were also looking at Massey and retired detective Bo Dietl, who is seeking to run on an independent line.

Long said Malliotakis has a grass-roots backing throughout the city, not just on her political turf in Staten Island and Brooklyn.

“It was a kind of clear Nicole had great grassroots support even though she got in the race late.

She’s going to surprise a lot of people,” he said.

Malliotakis said, “I want to thank the Conservative Party for their endorsement today. I have carried their endorsement in every race I’ve run and for that I am very grateful. New Yorkers realize that after nearly 3 ½ years of Bill de Blasio’s so called progressive policies we have a high rate of homelessness, high taxes, an increase in rape and sex crimes, runaway spending and a city steadily slipping back to the ‘bad old days’. With the Conservative Party, I share strong support for the NYPD and all law enforcement in our city, fiscal sanity and an education policy that includes strong support for Charter Schools. Paul Massey (R-Larchmont) has contributed to Democrats like Bill de Blasio and Comptroller Scott Stringer because he thinks like a Democrat and shares their views. Our battle for the GOP nomination will be a debate about principles and policies and the principles I hold will lead us to victory.”