Amelia Alcock (born 11 April 2000), known professionally as Milly Alcock, is an Australian actress. She received an AACTA Award nomination for her performance in the Foxtel comedy-drama Upright (2019–2022). She gained wider recognition for starring as young Rhaenyra Targaryen in the HBO fantasy series House of the Dragon (2022–2024), for which she was nominated for a Critics' Choice Television Award for Best Supporting Actress in a Drama Series.

Alcock will play Kara Zor-El, aka Supergirl, in James Gunn's DCU, starting with Supergirl (2026), following an uncredited cameo in Superman (2025).

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