Ui Mihara (三原羽衣, born September 22, 2002) is a Japanese actress and model from Hyogo Prefecture. She initially built a strong digital following through commercial modeling and social media before expanding into screen acting.

Her television and film credits include appearing in the reality drama Who is the Wolf? (2022), Takara-kun to Amagi-kun (2022), Shin Kamen Rider (2023), and various Japanese youth and romance series.