Bae Doona (Korean: 배두나; born October 11, 1979), anglicized as Doona Bae, is a South Korean actress and photographer. She debuted as a model and first gained recognition for her roles in Barking Dogs Never Bite (2000), Take Care of My Cat (2001), and Sympathy for Mr. Vengeance (2002). She became known for her performances as a Korean exchange student in Linda Linda Linda (2005), archer Park Nam-joo in The Host (2006), and as a sex doll that comes to life in Air Doll (2009). She has also starred in A Girl at My Door (2014), Tunnel (2016), Broker and Next Sohee (both 2022).

On television, she is well known as a leading character in the crime thriller Stranger (2017–2020), the Netflix period zombie thriller Kingdom (2019–2020), and the drama Family Matters (2024). She is also recognized for her roles in the Wachowski films Cloud Atlas (2012) and Jupiter Ascending (2015), Zack Snyder's Rebel Moon duology (2023–2024), as well as the Netflix television series Sense8 (2015–2018).

Bae was born in Jongno District, Seoul, South Korea. Growing up, she accompanied her mother, stage actress Kim Hwa-young, to theater and rehearsal halls, learning lines of dialogue as she went along. This did not initially lead her toward acting, however; she said: "People might say that since my mother is a theater actor, I became an actress. But to me, those experiences probably had the opposite effect. On the contrary, because I saw many great actors working with my mother, I thought this was a job only people with extraordinary talent could do."

As a Hanyang University student in 1998, Bae was scouted by a modeling agency in Seoul, leading to her modeling for COOLDOG's catalog among others. In 1999, she switched to acting before completing her studies at university, debuting in the TV drama School. Later that year, Bae appeared as Park Eun-suh in The Ring Virus, a Korean remake of the Japanese horror film Ring.

In 2000, director Bong Joon-ho cast Bae in the film Barking Dogs Never Bite for her willingness to do the part without makeup, which other South Korean actresses refused to do. She later cited it as the role that pushed her to pursue a serious acting career: "That film made me decide to become an actress—a good actress—and that film thereby changed my whole life." In Kim So-young's documentary Women's History Trilogy (2000–2004), Doona expressed her admiration for veteran South Korean actress Yoon Jeong-hee. In the same documentary, Bae said her most memorable scene had been being chased by the homeless man throughout the apartment in Barking Dogs Never Bite. That same year, she gave a risque performance (albeit with a body double for the more intense scenes) in Plum Blossom, and started getting more work on television.

This was followed by 2001's Take Care of My Cat, directed by Jeong Jae-eun, and 2002's Sympathy for Mr. Vengeance, directed by Park Chan-wook.

In 2003, both Tube and Spring Bears Love disappointed at the box office. After completing principal photography on Spring Bears Love, she decided to take time off from film work, saying, "I’ve never really had nothing to do. The moment a film was released, I was almost always already shooting the next one [...] I thought to myself: Now my first cycle is really over. While I rest a little, I wanted to make a fresh start."

During her hiatus from film, she took up photography, examples of which can be seen on her official blog and in her published photo-essay books. She also continued to work on TV, starring in Country Princess and Rosemary. She appeared on stage in 2004 in a production of Sunday Seoul (not to be confused with the South Korean movie of the same title), a play co-written by Park Chan-wook.