Rachelle Ann Villalobos Go-Spies (born August 31, 1986) is a Filipino singer and actress. Known primarily for her work in theater, she has starred in musicals on Broadway and in the West End. She began her career as a pop artist in her native country and has received many accolades, including an Aliw Award, an MTV Pilipinas Music Award, two Awit Awards, and five Myx Music Awards. Tatler magazine named her one of the most influential people in Asia in 2021.

Go started performing in singing competitions as a child, and first gained recognition after winning the television talent show Search for a Star (2003). She signed with Viva Records in 2004 and released her self-titled debut studio album, supported by the cover single "Don't Cry Out Loud". Go then competed at the 2004 Shanghai Music Festival and the 2005 Astana Song Festival, winning the Silver Prize and Best Song in each competition. Under the same record label, she released four more studio albums—I Care (2006), Obsession (2007), Falling in Love (2009), and Unbreakable (2011)—and performed rock-influenced covers on the live album Rachelle Ann Rocks Live! (2008). Apart from music, she also took on roles in the television series Diva (2010), Nita Negrita (2011), Biritera (2012), and Indio (2013).

On stage, Go made her theater debut playing the lead role of Ariel in the local production of The Little Mermaid in 2011, followed by the Meralco Theater's 2013 staging of Tarzan, in which she starred as Jane Porter. Go had her international breakthrough as Gigi Van Tranh in the West End revival of Miss Saigon in 2014, reprising the part on Broadway in 2017. She gained further recognition for her portrayal of Eliza Schuyler in the original 2017 West End production of Hamilton. Go has also played Fantine in various stagings and tours of Les Misérables, including the show's 30th anniversary at the Sondheim Theatre.