Several of those students have already been accepted to colleges, including Boston College. But the school claims the students don't have enough credits to graduate because of a bureaucratic mistake.
They were stunned to hear the bad news.
"For us to come in on a happy day and you tell us we're not graduating, what's that about?" said Chelsea Williams, one of the students at her high school barred from graduating.
Those nine seniors learned the news shortly before yesterday's graduation ceremony.
"I came in dressed up, with my family members, and they told me I wasn't going to graduate due to a mistake that the school made," said Moses White, another senior.
For reasons that are still unexplained, the students were simply told that they did not enough credits to graduate.
"I have 48 credits and I passed all my regents and I very well deserve to graduate. And you tell me this at the last minute?" said student Kitonna Rose.
The Department of Education says the seniors will have a chance to make up the necessary credits in summer school, which starts next week. But that adds pressure to those who were planning to go to college.
"I could register for college classes, but I might have to register for next semester. So I probably can't start for the fall semester because of this school," said senior Justina Acosta.