Ruby Lin Xin-ru (Chinese: 林心如; pinyin: Lín Xīnrú; born January 27, 1976) is a Taiwanese actress, television and film producer, and pop singer. American entertainment critic Derek Elley named Lin as "Taiwan's TV Drama Queen".3 years after Lin made her acting debut in a TV commercial, she rose to national and regional prominence overnight for her role as Xia Ziwei in the TV series My Fair Princess 还珠格格 (1998-1999). My Fair Princess was highly popular in East and Southeast countries; launching Lin as a household name in Asia. She followed the success with other hit series including The Duke of Mount Deer (2000), Romance in the Rain (2001), Boy & Girl (2003), Affair of Half a Lifetime (2004), Beauty's Rival in Palace (2010), The Glamorous Imperial Concubine (2011) and The Way We Were (2014).

While focusing mostly on TV series, her works also include film such as The House That Never Dies (2014), The Devotion of Suspect X (2017) and Miss Andy (2020). In 1999, she also began a singing career with her debut album Heartbeat released in Hong Kong first amongst Asian countries, and has since released 5 albums.

Since Lin started her own studio in 2009, she has been producing TV dramas and TV films starring herself, both in mainland China and Taiwan. Her production debut The Glamorous Imperial Concubine (2011) won her Best Producer at the 2012 TV Drama Awards Made in China, and her first Taiwanese drama production The Way We Were (2014) won three out of seven nominations, including Best Television Series at the 50th Golden Bell Awards.

According to Apple Daily, Lin was the third highest-earning Taiwanese drama actress in 2011, and the top-earning in 2012 and 2013. Lin ranked 30th on Forbes China Celebrity 100 list in 2013, 36th in 2014, 82nd in 2015, and 68th in 2017.