Wayne Lim Junjie (Chinese: 林俊傑; born 27 March 1981), professionally known as JJ Lin, is a Singaporean singer, songwriter, record producer, businessman, and a novelist.

His notable compositions include "Remember" (记得) for Taiwanese singer A-Mei, A-Do's "Let Go" (放手), Harlem Yu's "What's Wrong With You?"

(干嘛你看不爽我), Cyndi Wang's "When You" (当你), Vivian Hsu's "Smiling Eyes" (爱笑的眼睛), and Comic Boyz's "Heart of Superman" (超人心).

Lin also donated a large sum of money to the rescue efforts and composed a song "Love and Hope" (Chinese: 愛與希望; pinyin: Ài Yǚ Xī Wàng) commemorating the tragedy.

In February 2008, Lin released a compilation album entitled Waiting for Love (Chinese: 期待爱; pinyin: Qīdài Ài).

[11] Later in October of that year, his sixth album, Sixology (Chinese: 陸; pinyin: Liù), was released, and it sold 280,000 copies in a week.

It was held at the Royal Albert Hall, Hyde Park, Buckingham Palace and Raffles City Convention Centre, Singapore.

[14] In 2009, his singing career was put on hold due to his voice being damaged by acid reflux and flu, as well as his hectic touring and recording schedules.

[15] In June 2010, Lin performed together with American singer Sean Kingston at the opening concert of the Marina Bay Sands to thousands of invited VIPs guests.

He worked with a few notable people on the album, including Ashin, Harry Chang (张怀秋), and his older brother Eugene Lim (林俊峰).

On 7 July 2016, Lin released "If Miracles had a Sound", a 96-minute music documentary created over the course of 455 days, taking place throughout studios in the U.S., Singapore, Malaysia, Hong Kong, and Taiwan.

On 19 December 2017, JJ Lin posted on his Instagram page that the past two years "had not been easy" and that he had been "searching constantly for a clear direction", needing a "shelter for the soul, a 'SANCTUARY'".

[22] In January 2020, Lin released a song "I'll Stay With You" dedicated to the medical staff in Wuhan, China, who were working hard to save patients infected with COVID-19.

On 4 November 2016, Lin joined the variety show "Dream Voice" as one of the mentors alongside A-mei Zhang, Jam Hsiao, Hebe Tian, and Yu Quan.

[33] In July 2022, Lin said he is collaborating with Kiat Lim, son of Singaporean billionaire Peter Lim, and Elroy Cheo, a scion of the Cheo family that owns edible oils firm Mewah International, to co-found ARC, an app-based digital community that authenticates member profiles with non-fungible tokens (NFTs).