Wei Li-an (Chinese: 韋禮安; pinyin: Wéi Lǐ-ān; born 5 March 1987), known professionally as WeiBird, is a Taiwanese singer-songwriter. He has released six studio albums, one live album and two extended plays. Wei won the Golden Melody Award for Best New Singer in 2011 and Best Composer in 2015.

Wei gained media attention as the winner of the first season of the reality television singing competition Happy Sunday in 2007. He released his eponymous debut album William Wei in 2010, which received 4 nominations at the 22nd Golden Melody Awards and subsequently won him the Best New Artist award. His third studio album Journey into The Night received 2 nominations at the 26th Golden Melody Awards and the lead single "Wolves" (狼) won him the Best Composer award.

In 2021, Wei was nominated in four categories at the 32nd Golden Melody Awards for the album Sounds of My Life. Wei also received a nomination at the 58th Golden Horse Awards for Best Original Film Song with "Red Scarf" (如果可以). The song is also nominated for Song of the Year at the 33rd Golden Melody Awards.

Wei grew up in Taichung, Taiwan. His parents, Wei Chin-long (韋金龍) and Chen Yu-mei (陳玉美), were both professors in the foreign languages departments of National Chung Hsing University and National Chung Cheng University, respectively.

Wei's grandfather was a songwriter and both of his parents were previously choir members. Wei grew under their influences and has developed great sensitivity toward music. However, Wei did not pick up any music instruments when he was a child as he felt it would be tiring. Instead, Wei enjoyed drawing and wanted to become a comic artist when he grew up.

During his high school, Wei's father bought him his first guitar and he developed a passion for the instrument. He began learning the basic chords on his own and practiced it whenever he was free. Wei was inspired to start writing his own songs after watching a songwriting showcase by his school music club. He started composing songs and posted his works onto StreetVoice, a music-publishing platform for independent songwriters. His songs were very well received by the Netizens and Wei became one of the most popular songwriters on StreetVoice. Although most of Wei's works were notably Folk Pop, he also experimented with different music genres such as Bossa Nova, R&B, Soul Jazz and Disco.

Wei was accepted into one of the top universities in Taiwan, National Taiwan University, and pursued a major in Foreign Languages. In 2006, Wei decided to sign up for a school singing competition for fun and he performed Black Humor (黑色幽默) by Jay Chou. He won the competition unexpectedly and was selected to represent his school in the reality television singing competition, Happy Sunday. In the competition, Wei consistently impressed the judges with his good performances. He covered songs from many singers including David Tao, Stefanie Sun, Wang Leehom. Wei ultimately won the competition and was crowned the first winner of Happy Sunday.

However, Wei did a shocking decision by turning down the prize contract from the partnering music label. He decided to put his budding music career on hiatus and continues his study. Wei felt that he was not ready to become a singer and he did not want to be bonded by a contract. In addition, he was uncomfortable with the sudden fame and wanted to take a break after the intense singing competition. Wei returned to his student life and continued publishing his songs on StreetVoice. Wei's works dominated the music charts on StreetVoice and many of his works remained in the top ten positions for more than two years. He started writing songs for singers such as FanFan, Angela Zhang and Rene Liu.