Dianna Agron was born april 30, 1986 in Savannah, Georgia, and raised in San Antonio, Texas, and San Francisco, California, the daughter of Mary and Ronald S. Agron, a general manager of Hyatt hotels. Due to her father's career, Agron said she and her family lived in different hotels growing up. She has a younger brother, Jason. Her father was born to a Jewish family, while her mother converted to Judaism. Agron attended Hebrew school and had a Bat Mitzvah. Agron's paternal ancestors were Jewish immigrants from Eastern Europe, and according to her, their original surname, Agronsky, was altered by Ellis Island officials. When she was 15, she found out that her father had multiple sclerosis. In an interview for Cosmopolitan, she revealed, "Quite a bit changed after that. At that age, you don't see mortality in your parents." The disease caused her parents' relationship to fall apart, and they decided to separate, which was devastating for her and her younger brother. She stated, "I had to play therapist to my family... be the glue. Those kinds of things I'm not ready to speak about yet." Agron attended Burlingame Intermediate School and Burlingame High School, where she was in the Homecoming Court and played the part of Marty in Grease; she was also involved in set design, costumes, and painting. She has been dancing since the age of three, focusing mainly in jazz and ballet, and later began hip-hop dancing.

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