The former head of security at Roxbury Community College is suing the school and three of its officials for wrongful termination and defamation, arguing that he was fired for disclosing the college’s failure to report allegations of sexual assault on campus as required by federal law.

“Instead of protecting students . . . the administration and officers at the college have protected their own,” a lawyer for Thomas Galvin, the school’s former director of facilities and public safety, wrote in a civil complaint filed Oct. 19 in ­Middlesex Superior Court.