Laia Costa (Catalan: [ˈlajə ˈkɔstə]; born February 18, 1985) is a Spanish actress. She is best known for starring in the critically acclaimed one-shot German thriller Victoria (2015), for which she received several accolades, including a German Film Award for Best Actress and a BAFTA Rising Star Award nomination, becoming the first foreign actress to win a Lola. After initial minor television roles in Spain, including an appearance in Polseres vermelles (2013), she went on to star in the romantic dramas Newness (2017) and Only You (2018), the horror thriller Piercing (2018), the romantic comedy Duck Butter (2018), and the multi-narrative drama Life Itself (2018).

Costa has also appeared in the television series Foodie Love (2019), Devils (2020), and the science fiction anthology Soulmates (2020). She gained widespread acclaim in Spain for her portrayal of Amaia in Lullaby (2022), becoming the most acclaimed performance of the awards season, winning the Goya Award for Best Actress, along with a Feroz Award, a Forqué Award, and a Platino Award. She later starred in the romantic drama Un amor (2023), earning her a second Platino Award, and portrayed Moghedien in the Amazon Prime Video series The Wheel of Time (2023–2025).