Miho Miyahara (宮原 美穂, Miyahara Miho, born 3 September 1996) is a Japanese karateka. She is a two-time gold medalist in the women's kumite 50 kg event at the World Karate Championships (2018 and 2021). She also won the gold medal in this event at the 2018 Asian Karate Championships. She represented Japan at the 2020 Summer Olympics in Tokyo, Japan in karate. She competed in the women's 55 kg event.