This section needs expansion. You can help by adding to it. (May 2015)
She moved into acting in 2010 on the web series Hollywood Is Like High School with Money, based on the book of the same name, playing Quinn Whitaker. She also appeared in an episode of the Disney XD sitcom Zeke and Luther and then in the 2011 Disney Channel Original Movie Geek Charming. Also that year, she had a small role in an episode of the sitcom Mr. Sunshine.
In 2012, Simmons starred in the film Fat Kid Rules the World, and guest starred in an episode of Jane by Design. In 2013, she appeared in an episode of Vegas and began playing Rebecca Bowman, a rebellious Amish girl on the Cinemax series Banshee. She originally auditioned for the role of Deva Hopewell, but: "They said, 'She's too old or too sexy' or whatever". While in Philadelphia for her grandmother's funeral, the producers asked her to go back to New York to read for Rebecca, after which she won the role. In March that year, she appeared in a pictorial in Maxim magazine.
In 2014, Simmons began recurring roles on Hawaii Five-0, and the HBO series True Detective. In April 2016 she was cast in what has been stated will be a recurring role in another HBO series, Westworld, though she appeared in only one episode during the first season. In February 2017 Simmons was cast in a season-long arc on the fifth season of the Showtime drama series Ray Donovan playing Natalie James, "the star of a big movie franchise".
|2012||Fat Kid Rules the World||Isabel|
|2015||Bone Tomahawk||Samantha O'Dwyer|
|2016||Robyn Hood: I Love NY||Robyn Hood||Short film|
|2017||Deux Face||Sand||Short film|
|2010||Zeke and Luther||Mia||Episode: "Sludge"|
|2011||Mr. Sunshine||Hot Teenage Girl||Episode: "Employee of the Year"|
|2011||Geek Charming||Lola||Television film|
|2012||Jane by Design||Piper Grace||Episode: "The Teen Model"|
|2013||Vegas||Fay Binder||Episode: "Road Trip"|
|2014||True Detective||Beth||2 episodes|
|2013–2016||Banshee||Rebecca Bowman||Main role|
|2014–2017||Hawaii Five-0||Amber Vitale / Melissa Armstrong||Recurring role, 6 episodes|
|2017||Ray Donovan||Natalie James||Recurring role (season 5), 8 episodes|
|2016; 2018||Westworld||New Clementine||Episodes: "Trace Decay", "Akane no Mai"|
|2018||The Purge||Lila Stanton||Main role|
|2018||Law & Order: Special Victims Unit (season 20)||Gina Goodrich||Episode: "Accredo"|
|2010||Hollywood is Like High School with Money||Quinn Whitaker||9 episodes|
|2013–2016||Banshee Origins||Rebecca Bowman||3 episodes|
- Simmons, Lili [@Liliflower33] (May 27, 2015). "To correct IMDB and Wikipedia, my birthday is July 23rd 1993. NOT 1992 I'm 21 and will be 22 in July. Thanks guys!😜" (Tweet). Retrieved May 5, 2017 – via Twitter.
- Simmons, Lili [@Liliflower33] (May 5, 2017). "Love my home town. #cardiffbythesea #bornandraised #socalgirl #cardiffkook" (Tweet). Retrieved November 10, 2016 – via Twitter.
- "Lili Simmons". Ladygunn. April 20, 2016. Retrieved September 28, 2016.
- "New Faces at Ford by Jason Lee Parry". Fashion Gone Rogue. May 31, 2010. Retrieved January 25, 2014.
- "Lili Simmons". Pop Tower. Archived from the original on February 2, 2014. Retrieved January 25, 2014.
- "Hollywood Is Like High School with Money". Alloy Entertainment. Archived from the original on April 23, 2012. Retrieved January 25, 2014.
- "Hollywood Is Like High School with Money". TV.com. Retrieved January 25, 2014.
- "Exclusive: Disney Channel Starlet Takes Racy Turn in Cinemax Drama Series Banshee". tvline.com. April 10, 2012. Retrieved January 25, 2014.
- "Higher Power". tvline.com. Retrieved January 25, 2014.
- "Lili Simmons Talks "Banshee" and Being Nude In Front of America". Maxim. 22 July 2013. Retrieved January 25, 2014.
- Levine, Stuart (January 30, 2013). "Simmons added to HBO's 'True Detective' cast". Variety. Retrieved January 25, 2014.
- "Lili Simmons Joins 'Westworld' As HBO Drama Series Resumes Production". Deadline. April 6, 2016. Retrieved September 28, 2016.
- Sandberg, Bryn Elise (February 13, 2017). "'Ray Donovan' Adds Trio to Season 5 (Exclusive)". The Hollywood Reporter. Retrieved May 5, 2017.
- "Watch 'Banshee' Star Lili Simmons in Zenescope's New 'Robyn Hood' (Exclusive Video)". The Wrap. Retrieved 13 November 2016.