Younha (Korean: 고윤하; 高潤荷; Go Youn-ha, Japanese: ユンナ , Yunna), born April 29, 1988 in Seoul, Korea, is a K-Pop and J-Pop singer.

Younha made her debut as an artist at the young age of sixteen. Nicknamed the "Oricon comet" for her success in Japan, she has currently released eight singles and one album in that country with varying degrees of success. Also, many of her songs have been featured in anime/dramas. Although she is often compared to BoA both who are active in Japan, speaks Japanese well and is one of the few Koreans to rank on the Oricon chart, there are significant differences between their musical style and performance.

Younha is signed to Epic Records, owned by Sony Music Japan. Her Korean agency is Stam Entertainment.