Diane Guerrero (born July 21, 1986) is an American actress and singer. She is known for her roles as inmate Maritza Ramos in the Netflix series Orange Is the New Black and Lina on Jane the Virgin. Her role on Orange Is the New Black has contributed to three consecutive wins for the Screen Actors Guild Award for Outstanding Performance by an Ensemble in a Comedy Series. Guerrero is the author of In the Country We Love: My Family Divided, a memoir about her parents being detained and deported when she was fourteen. She starred as Kay Challis / Crazy Jane in the Max action-drama series Doom Patrol. She also voiced characters such as Jessica Cruz / Green Lantern in Justice League vs. the Fatal Five and Isabela Madrigal in the 2021 Disney film Encanto.

Guerrero was born on July 21, 1986 in Passaic, New Jersey. She has an older maternal half-brother (born 1976). Her parents and brother emigrated from Palmira, Colombia in 1981 and settled in Boston, Massachusetts in 1987.

As the only member of her immediate family with American citizenship, Guerrero remained in the U.S. at the age of fourteen when her parents and older brother were deported back to Colombia after unsuccessfully pursuing legal citizenship. She emphasized that even though she was a minor, no government agency reached out to see if she was okay after this occurred. She relied solely on her friends' parents to help get her through the rest of high school and beyond. Guerrero has since become a strong advocate for immigration reform.

Guerrero was raised in the Jamaica Plain and Roxbury neighborhoods of Boston after being taken in by other Colombian families. She attended Boston Arts Academy, a performing arts high school, where she was in the music department. Among her high school activities was singing with a jazz group, but she anticipated pursuing political science and communications in college. She then studied political science and communications at Regis College, studying abroad at Regent's University London during her junior year. Her first job after college was in a law office.

In 2010, at age twenty-four, Guerrero decided to pursue a career in acting. That same year, she appeared in the music video for Boston-based R&B singer Louie Bello's song "Faces". In 2011, she moved to New York City and studied acting at the Susan Batson Studios, where she met her manager Josh Taylor.^{[citation needed]}

In 2012, Guerrero was cast in Orange is the New Black in the role of Maritza Ramos, a Bronx-bred character with Colombian roots. For season 2, she was part of the cast that earned recognition for Outstanding Performance by an Ensemble in a Comedy Series at the 21st Screen Actors Guild Awards. The cast earned recognition for Outstanding Performance by an Ensemble in a Comedy Series again at the 22nd Screen Actors Guild Awards and 23rd Screen Actors Guild Awards. She remained part of the show through season 5. She returned for the final season in 2019.

In 2014, Guerrero was cast in a recurring role on The CW series Jane the Virgin. In February 2015, Guerrero was cast as the female lead in CBS' television pilot for Super Clyde, but the show was not picked up for series. In 2017, Guerrero was cast in a regular role for season 2 of Superior Donuts. Guerrero has appeared in the films Emoticon ;), Peter and John, and Happy Yummy Chicken. In 2018, she appeared in the films Beyond Control and The Godmother.

In 2016, Guerrero released In the Country We Love: My Family Divided, a memoir about her parents being detained and deported when she was 14. The book was written with Michelle Burford and published by Henry Holt and Co. A drama based on her memoir was picked up by CBS, to be developed into a drama executive produced by Jennie Snyder Urman, Ben Silverman, and Paul Sciarrotta, with Snyder attached as the showrunner. Guerrero was initially set to play the lead. In 2017, CBS decided to pass on the project, but was picked up by Fox. As of January 2018, no pilot for the series has been ordered.^{[needs update]}