Nassau District Attorney Madeline Singas took her oath of office Monday in a ceremony that followed her election in November as the county’s top prosecutor, vowing to uphold her campaign promise of fighting government corruption.

“Nothing is more important for my administration than to take on public corruption,” Singas, 49, said to loud applause. “ . . . I will follow the law without fear and without favor.”

The Democrat, who lives in Manhasset, also told those present for the ceremony at the Cradle of Aviation Museum in Garden City that her independence will never be compromised.

“I stand here because of what I know, not who I know,” she said. “ . . . I assure you that I will bring the cases that we need to bring to make sure that our government is working for us.”

New York’s new Chief Judge Janet DiFiore administered the oath to Singas in an event that included remarks from members of Singas’ family and elected leaders.

Singas has served for the past year in the same job in an acting capacity after former District Attorney Kathleen Rice’s election to Congress.

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Singas, the daughter of Greek immigrants, has said that her rise to the county’s top prosecutorial position shows “the American dream is alive and well in Nassau County.”

Her sister, Dr. Effie Singas, recalled Monday that the Singas family, including the sisters’ late parents, “always knew that Maddy would become a lawyer” because “she could win any argument.”

Effie Singas recalled how the county’s top prosecutor, as a teen, convinced their father that going to an Ivy League college would be a much better value even though she’d won a full scholarship elsewhere.

“Anyone who knew our dad knew that was her best summation ever,” the doctor said.

Sen. Chuck Schumer (D-N.Y.) recapped Singas’ background as a prosecutor, the career path that led to her run for office, and what he called an election victory against the odds.

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“Today is a great day for Madeline Singas because she got here the old-fashioned way; she earned it,” Schumer said.

Under Rice’s administration, Singas served as top deputy starting in 2011 after she had led the office’s special victims bureau.

Before coming to work in Nassau in 2006, Singas, a Fordham University School of Law graduate, served as deputy chief of the domestic violence bureau at the Queens district attorney’s office.

New York State Attorney General Eric T. Schneiderman told the crowd Singas would bring independence and integrity to the job.

“You have elected a leader who seeks to do justice at a time when people are really hungry for justice,” he said, adding that she had the heart and commitment to prosecute corrupt elected officials.

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“Madeline understands that if you betray the oath of office, you have to be held accountable,” Schneiderman added.

Singas defeated Republican Kate Murray, the former Town of Hempstead supervisor, winning about 58 percent of the vote.