Daniela Melchior (European Portuguese: [dɐniˈɛlɐmɛlʃiˈɔɾ]; born 1 November 1996) is a Portuguese actress. Born in Almada, Setúbal, she launched her career in 2014 with a role in the telenovela Mulheres. She went on to appear in the teen drama Massa Fresca (2016), telenovelas Ouro Verde (2017), and A Herdeira (2018). Melchior made her film debut in 2018 with The Black Book. She provided the Portuguese dubbing for Gwen Stacy in Spider-Man: Into the Spider-Verse and was cast in the comedy-drama Parque Mayer in the same year. Her performance in the latter earned her a nomination for the Sophia Award for Best Actress.

She had her international breakthrough as Cleo Cazo in the DCEU film The Suicide Squad (2021), which earned her a nomination for Best Newcomer at the Portuguese Golden Globes. Subsequently, she took on minor roles in English-language films, including Marlowe (2022), Assassin Club (2023), Guardians of the Galaxy Vol. 3 (2023) and Fast X (2023).