Dianna Elise Agron was born in Savannah, Georgia to Mary and Ronald Agron and grew up in a middle-class family in Savannah before moving to Texas and, later, San Francisco, California, because her father was a general manager for Hyatt. Dianna and her brother Jason were raised Jewish and she graduated from Burlingame High School with honors.

While Dianna was growing up, she spent much of her time performing. She began dancing at age three, focusing mainly on jazz and ballet; she later began hip-hop dancing. She also appeared in many local musical-theater productions.

After graduating from high school, Dianna decided to pursue acting as a career and began appearing in commercials and television shows including CSI: NY (2004), Numb3rs (2005), Veronica Mars (2004), and Heroes (2006). In 2009, she won the role of high-school cheerleader Quinn Fabray on the FOX television series Glee (2009). Since the hit television show's premiere on May 19th, 2009, she and her castmates have received critical praise for well as her fellow cast mates, have received critical praise for their incredible work. In addition to her work on, Glee (2009), Dianna has ventured into films, such as Burlesque (2010), where she had the opportunity to star alongside Christina Aguilera, Cher, and Stanley Tucci, and the action thriller I Am Number Four (2011). There is no doubt that her beautiful talent will shine for years to come.