Dianna Agron has appeared on television shows such as Shark, Close to Home, CSI: NY, Numb3rs and a recurring role on Veronica Mars. She then appeared as Harper on a 13 episode series of short films called It's a Mall World, directed by Milo Ventimiglia, and airing on MTV, and then on the second season of Heroes, also with Ventimiglia.

Agron's most notable role to date is likely as Quinn Fabray, a high school cheerleader, on the FOX series Glee, which has received high ratings and critical acclaim since the series began in September 2009.