Alexandra Castillo (born 14 June 1971) is a Chilean-Canadian actress and dancer, known for her roles on both Canadian and American television. She has been credited, in almost equal distribution throughout her career, as Alex Castillo.

Castillo was born in Santiago, Chile as Alexandra Cecilia Castillo-Smith. As a child, her family moved to Toronto, where she was raised.^[2] She got her start on stage through dance, having studied both ballet and flamenco from childhood. Through high school and university, she did theatre and commercials. After completing a master's degree in Latin American studies.^[2][1] As of late 1990s, Castillo appeared in several television series and films. She made her television debut in 1999 appearing in an episodes of television series Dead Man's Gun and Seven Days, and the following year played a minor role in the science fiction action film The 6th Day.^[1]

Castillo made guest-starring appearances in more than 50 television series, include The Dead Zone, Missing, The Eleventh Hour, Degrassi: The Next Generation, The Border, Heartland, Fringe,The Listener, Warehouse 13, Murdoch Mysteries, Rookie Blue, Saving Hope, Designated Survivor, The Expanse, The Handmaid's Tale and The Boys. She starred in Guidestones, a Canadian award-winning web series from 2012 to 2014. In 2004 she had the recurring role during the first season of CBC legal drama series, This Is Wonderland. In film she appeared in Traitor (2008), 2012 (2009) and Miss Sloane (2016), and as well appeared in a made-for-television movies Miracle on the 17th Green (1999), The Wool Cap (2004), Plague City: SARS in Toronto (2005), The Path to 9/11 (2006), Eye of the Beast (2007), Taken in Broad Daylight (2009) and Believe Me: The Abduction of Lisa McVey (2018).

In 2013, Castillo starred as a series regular on the short-lived ABC drama series, Lucky 7.^[3] In 2016 she had recurring role in the Starz drama series, The Girlfriend Experience and from 2017 to 2018 starred in the Global drama series Mary Kills People. In 2020 she starred as Chancellor Diara in the Hulu science fiction series, Utopia Falls and had recurring role in the Netflix teen drama Grand Army. In 2021 she had recurring role in the CW series Legends of Tomorrow as Gloria Cruz and the following year co-starred in the Apple TV+ miniseries Five Days at Memorial. In 2023 she had recurring roles in the Paramount+ thriller Rabbit Hole and the AMC science fiction series Orphan Black: Echoes.^[4]

‡ denotes credited as Alex Castillo

• Alexandra Castillo at IMDb