The FDNY’s first chief diversity and inclusion officer is leaving the post after less than a year on the job, the FDNY said Thursday.

Pamela Lassiter was sworn in Jan. 30.

Sources said that Lassiter’s departure came as a surprise. “Here we have someone who is academically qualified. She’s a black, female . . . Then, suddenly — bam, she’s gone,” one fire official said.

The position was created after a judge ruled that the FDNY’s entrance exam was biased against minorities.

Commissioner Daniel Nigro, in a statement on Lassiter’s exit, stressed the FDNY’s progress in improving that record.

“Our commitment to becoming a more diverse and inclusive department has never been stronger and will continue to be a key strategic initiative,” he said.

The FDNY would not say why Lassiter left.