Park Sun-young (Korean: 박선영; born August 12, 1993), known professionally as Luna (루나), is a South Korean singer, dancer, musical actress and television host. She debuted as a member of the girl group f(x) in September 2009. In May 2016, Luna released her solo EP Free Somebody. In November 2019, the single "Free Somebody" was listed in Billboard's greatest K-pop songs of the 2010s. In September 2019, Luna left SM Entertainment and joined Humap Contents. In February 2021, Luna established her entertainment agency, Grida Entertainment.

Aside from her music career, Luna has established herself as a musical actress, notably through her participation in the original and Korean versions of stage musicals including Legally Blonde (2010–2011), Coyote Ugly (2011), High School Musical on Stage! (2013), School OZ Hologram Musical (2014), In the Heights (2015–2016), Rebecca (2017), Rudolf (The Last Kiss) (2017–2018), Autant en emporte le vent (Gone with The Wind) (2018), Mamma Mia! (2019–2020), The Days (2020–2021) and KPOP (2022). She also starred in the film The Lightning Man's Secret (2015).

On television, Luna hosted the music program The Show (2011), the third season of the reality show Get It Beauty (2016). She also appeared as a regular cast member on the reality shows Strong Girls (2017), The Suitcase Man (2017), The Taming of the Shrew 2 (2017), Beauty Code (2017), and Dressing Table 3 (2017–2018).