Ruby Lin Xin-ru (Chinese: 林心如; pinyin: Lín Xīnrú; born January 27, 1976) is a Taiwanese actress, television and film producer, and singer.

Lin began her career as a commercial model in 1993 and gained pan-Asian prominence for her role as Xia Ziwei in the megahit TV series My Fair Princess (1998-1999). She followed the success with TV series such as 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, she also starred in films such as The House That Never Dies (2014), The Devotion of Suspect X (2017) and Miss Andy (2020). As a singer, she released six albums, beginning with Heartbeat (1999).

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-earner 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.