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Zinser's first appearance on television was in 2009 in an episode of the Cupid. She also made an appearance in the Cold Case series before joining the cast of 90210, where she played the role of Ivy Sullivan, a 17-year-old high school girl who struggles to get what she wants and who practices surfing at a high level.
In 2011, Zinser appeared in her first feature film, The Truth Below, a television film for MTV. She also joined the cast for the thriller Liars All, alongside Matt Lanter and Sara Paxton. In May 2012, Gillian announced that she was leaving the 90210 series. She also made an appearance in the Oliver Stone film, Savages.
|2010||The Truth Below||Jenna|
|2015||Two Wrongs||Sarah Harris|
|2015||End of Babes||Elly|
|TBA||Holy New York||Rose||Post-production|
|2009||Cupid||Beatnik||Episode: "The Great Right Hope"|
|2009||Cold Case||Vonda Martin||Episode: "Hood Rats"|
|2009–2012||90210||Ivy Sullivan||Recurring role (season 2); main role (seasons 3–4)|
|2010||Southland||Chloe Sherman||Episode: "Butch & Sundance"|
|2018||Blindspot||Eve||Episode: "Case: Sun, Moon, and the Truth"|
|2019||Stumptown||Coach Mary Jane 'MJ' Glenway||Episode: "Dex Education"|
- "90210's Gillian Zinser: "I'd Love to Put on a Few Pounds"". US Magazine. February 21, 2012. Retrieved November 5, 2017.
- "Brian Brightly's 'Liars All' to Begin Production". Hollywood Reporter. April 15, 2011. Retrieved November 5, 2017.