Who was the actor that played the black nerd with glasses on saved by the bell

The actor was Dustin Diamond , who played Samuel “Screech” Powers on Saved by the Bell.

Quick Scoop

Screech was the show’s signature nerdy character, known for his glasses, awkward charm, and comic relief. Dustin Diamond became closely associated with the role after appearing across the original series and later related projects.

Extra Note

If you meant a different background nerd character, there were also smaller recurring “nerd” roles on the show, but the most famous one people usually mean is Screech.

TL;DR: It was Dustin Diamond as Screech.