The principal of the public Harlem Renaissance High School is a self-help obsessive who pressured his staffers to pony up hundreds of dollars for the popular Landmark Forum self-improvement courses, a new lawsuit alleges.

Principal Nadav Zeimer repeatedly pressed Spanish teacher Catherine Owens and other staffers to join Landmark, a program that can cost upwards of $600 for a weekend, according to Owens’ lawsuit filed in Manhattan federal court.

When she refused, she was singled out for poor treatment, according to the lawsuit filed Tuesday.

Owens, who described Landmark as a “religious or quasi-religious organization,” is suing for discrimination based on religion and disability.

She said her problems with Zeimer started because of a tardiness problem she attributed to ADHD and a skin condition that often flared up in the morning. She requested accommodation for her disabilities, including a different class schedule, but was refused, she said.

Instead, Zeimer tried to help Owens in ways that involved Landmark, including disclosing her private medical issues to another Landmark adherent who reached out unsolicited and offered to be her “life coach,” she said.

In addition to emails encouraging staffers to join Landmark, Zeimer also held a Landmark session at his home after school hours, the lawsuit said. Owens attended that session “out of fear,” and once she got there Zeimer pressured her to fork over a $200 deposit for a $600 course, she said.

Zeimer, who has been credited with improvements at the East 128th Street school in recent years, declined to comment.

“The complaint will be reviewed by the Law Department,” a spokesman said.

Owens said she was temporarily transferred out of Harlem Renaissance because of her clashes with Zeimer. She has since been brought back but has not been provided a desk and was told to find a cart to push her supplies from classroom to classroom, she alleges.