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| Año | Título | Personaje | Valoración |
|---|---|---|---|
| 2024 | Sharp Corner | Tamara Jones-Reed | ☆☆☆☆☆ |
| 2024 | Orphan Black: Echoes | Neva Lee | ★★★★☆ |
| 2023 | Champions | Judge Mary Menendez | ★★★☆☆ |
| 2023 | Rabbit Hole: Juego de mentiras | Olivia Bonen | ★★★★☆ |
| 2023 | Generación V | Vanessa | ★★★★☆ |
| 2023 | Nesting | Leia | ★★★★☆ |
| 2020 | An Arthur Thanksgiving | Shania (voice) | ☆☆☆☆☆ |
| 2020 | La Maestra (A Teacher) | Principal Rivas | ★★★★☆ |
| 2020 | Nurses | Mrs. Grant | ★★★★☆ |
| 2020 | Grand Army | Ms. Lisa Gonzalez | ★★★★☆ |
| 2019 | Dreams | Lisa | ☆☆☆☆☆ |
| 2019 | The Boys | Vanessa | ★★★★☆ |
| 2018 | Believe Me: The Abduction of Lisa McVey | Det. Castle (as Alex Castillo) | ★★★★☆ |
| 2017 | Mary me mata | Louise Malick | ★★★★☆ |
| 2017 | Las crónicas del miedo | Claire Whitaker | ★★★★☆ |
| 2017 | El cuento de la criada | Dawn Mathis | ★★★★☆ |
| 2016 | El caso Sloane | Pru Walsh | ★★★★☆ |
| 2016 | Incorporated | Susan | ★★★☆☆ |
| 2016 | Private Eyes | Maxine DeMuzio | ★★★★☆ |
| 2016 | 22.11.63 | Mayor | ★★★★☆ |
| 2016 | The Girlfriend Experience | Jacqueline | ★★★★☆ |
| 2016 | DC's Legends of Tomorrow | Gloria Cruz | ★★★★☆ |
| 2016 | Damien | Arlene (as Alex Castillo) | ★★★☆☆ |
| 2015 | Bark Ranger | Sharon Keller | ★★☆☆☆ |
| 2015 | The Expanse | Captain Espinoza | ★★★★☆ |
| 2014 | Remedy | Mrs. Murdoch | ★★★☆☆ |
| 2013 | Lucky 7 | Bianca Clemente | ★★☆☆☆ |
| 2012 | La tapadera | USADA Mary Connor | ★★★☆☆ |
| 2011 | Against the Wall | Elizabeth Northcutt | ★★★★☆ |
| 2010 | Rookie Blue | Detective Inez Capello | ★★★★☆ |
| 2009 | Secuestro a plena luz | Agent Reynolds | ★★★☆☆ |
| 2009 | 2012 | Paris Reporter | ★★★☆☆ |
| 2009 | Almacén 13 | Lisa | ★★★★☆ |
| 2009 | The Listener | Detective Patty Sinclair | ★★★☆☆ |
| 2008 | Traidor | Dark Haired Woman | ★★★☆☆ |
| 2008 | Fringe | Dr. Alexandra Castro | ★★★★☆ |
| 2007 | El monstruo del lago | Katrina Tomas | ★★★☆☆ |
| 2007 | Heartland | Dr. Kelsey Burton | ★★★★☆ |
| 2005 | Plague City: SARS in Toronto | Aline | ★★★☆☆ |
| 2004 | Kevin Hill | Mariel Arden (as Alex Castillo) | ★★★☆☆ |
| 2002 | Pasión Frente al Mar II | ☆☆☆☆☆ | |
| 2001 | Mutante-X | Gina | ★★★☆☆ |
| 2000 | El sexto día | Reporter (as Álex Castillo) | ★★★☆☆ |
Películas destacadas de Alexandra Castillo
Estas son las películas más destacadas en las que ha trabajdo:
Series
