A Queens high-school principal’s decision to limit after-school use of the gym has parents and kids livid — and sparked a protest yesterday outside the building.

About 25 students rallied outside Martin Van Buren HS to protest Principal Marilyn Shevell’s rule that the gym be used for practice and home games only on Wednesdays, Fridays and Saturdays.

Home games scheduled for Tuesdays and Thursdays conflict with night school, which ends next month, Department of Education spokeswoman Marge Feinberg explained.

Anger over the limits only worsened last night when Shevell failed to show up for a PTA meeting.

“It’s a slap in the face,” parent Dianne Payne said.