Younha (Korean Hangul: 고윤하; hanja: 高潤荷; Go Yoon-ha, Japanese Katakana: ユンナ, Yunna) born April 29, 1988 in Seoul, Korea, is a K-Pop and J-Pop South Korean 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 released eight singles and two albums there with varying degrees of success. Several of her songs have been featured in anime and drama series.

Younha was signed to Epic Records, a branch of Sony Music Entertainment Japan, from 2004 to 2008, after which she moved to Sistus Records, a Geneon Entertainment label. In South Korea, she is signed to Lion Media and Stam Entertainment.