The father of a boy killed in the Sandy Hook school shooting has been awarded $450,000 in a lawsuit against a conspiracy theorist who claimed the massacre never happened.

Leonard Pozner, whose 6-year-old son, Noah, was the youngest of 26 killed in the Connecticut slaughter, successfully sued the authors of “Nobody Died at Sandy Hook” for claiming he faked copies of his son’s death certificate.

The book accused him of being a central part of a conspiracy staged by the Obama administration to enforce tighter gun restrictions. Pozner’s attorney, Genevieve Zimmerman, called the conspiracy “alt-right opium” that “went around the internet like a virus.”

James Fetzer, a retired University of Minnesota Duluth professor, was ordered Tuesday to pay $450,000 by the Wisconsin jury that took almost four hours to decide the amount.

Pozner thanked the Dane County jury “for recognizing the pain and terror that Mr. Fetzer has purposefully inflicted on me and on other victims of these horrific mass casualty events,” according to the the Wisconsin State Journal.

“Mr. Fetzer has the right to believe that Sandy Hook never happened,” he said, according to the report. “He has the right to express his ignorance.

“This award, however, further illustrates the difference between the right of people like Mr. Fetzer to be wrong and the right of victims like myself and my child to be free from defamation, free from harassment and free from the intentional infliction of terror.”

Fetzer, who now lives in Wisconsin, called the damages “absurd” and said he would appeal.

The book’s co-author, Mike Palacek, reached a settlement with Pozner last month. The terms were never disclosed.

Pozner is among a group of Sandy Hook parents whose defamation case against right-wing conspiracy theorist and “Infowars” host Alex Jones is pending, the State Journal reported.

With Post wires