Terence Lam Ka-him (Chinese: 林家謙; born 3 September 1991) is a Hong Kong composer, singer-songwriter, and record producer. Lam had a musical interest since a young age, which he started to learn playing the piano when he was four or five years old. He attended the Lingnan University, where he received the Bachelor of Arts (Honours) in Contemporary English Studies in 2013. During his university studies, Lam participated in several college singing competitions, where he met the singer-songwriter Chet Lam who brought him into the music industry. In 2014, he became a composer, signing a contract for Warner Chappell Music Hong Kong where at one point he was composing one song a week.

Lam has composed songs for the singers Eason Chan, Jason Chan, Hins Cheung, Pakho Chau, JW, Charmaine Fong, Alfred Hui, Eman Lam, Janice Vidal, Rainie Yang, and Joey Yung. Pakho Chau's 2014 song "About Us" (關於我們) was Lam's first composition to achieve commercial success. Lam's composition of the JW song "A Lifetime of Contradictions" (矛盾一生) was the first to receive widespread attention. Lam's songs are in the traditional genres of pop music and Cantopop though he puts his own twist on his songs through tempo changes and melody trends.

In 2019, Lam made a career change from being a composer to being a singer-songwriter. In January of that year, he released the song "NEXT" (下一位前度), which hit several charts and became the first song that made him well-known as a singer. The next year, he released "Solitude" (一人之境), which was broadly praised. In May 2020, he released his debut album, Major in Minor whose name was inspired by how he is an independent musician. Although he writes songs for a record label, he remains an independent singer who is not signed to a label or a talent manager. Lam has received composer, arranger, and singer awards from RTHK, Ultimate 903, and ViuTV. He received the best composer award from RTHK in 2016 and 2017, the best new artist award from Ultimate 903 in 2020, and the best composer, best arranger, and best male singer awards from the ViuTV Chill Club awards in 2021.

Lam was born on 3 September 1991 in Hong Kong. Born to a moderately well-off family, he has three brothers and is the youngest child in the family, one of whom is a grade eight pianist who provides him suggestions when he composes music. Lam started learning piano when he was around four to five years old and achieved ABRSM grade five ultimately. As a child, he enjoyed music and completed at a Wan Chai District music competition when he was around six to seven years old. At the age of 14 to 15, he spent HKD$700 (US$90.09) to purchase a microphone and mixing console online, which he used the equipment to start recording music covers to share online. Lam is an Introvert. When he was in secondary school and university, Lam felt he lacked control and the ownership of his voice and did not respect nor felt confident in his own singing. He stopped singing for a brief period of time due to his lack of confidence in controlling his voice after experiencing his voice change during his puberty. Lam attended St Joseph's College, a Catholic boys' secondary school in Hong Kong. He is also an alumnus of Hong Kong Sze Yap Commercial and Industrial Association Wong Tai Shan Memorial College [zh], where he completed his sixth form studies. He is 171 cm (5 ft 7 in) tall. Lam graduated in 2013 from Lingnan University, where he received an honours Bachelor of Arts degree in Contemporary English studies. The reason he studied English in university was due to English being his best performed A-level subject. While at university, he and a female student sang in a university singing contest and an interuniversity singing contest, where he won the first place in both competitions. Mentioning in an interview that he has somewhat of a Buddha-like mindset, Lam was last in a relationship when he was 25 or 26 years old. Lam lives with his family. Prior to entering the music industry, Lam worked at a technology company.

Lam entered the music industry in 2014 as a songwriter with Chet Lam's help. They met at a university singing competition where Chet Lam was a guest performer. Chet Lam liked Terence Lam's work, and they signed an agreement to have the latter write songs for the former. Lam subsequently signed a contract with Warner Music Group to be a composer, where at one point, he was composing one song a week for the company. The singer Pakho Chau's 2014 song "About Us" (關於我們) was the first of Lam's compositions to achieve commercial success. "About Us" was Lam's fifth or sixth demo. His composition of the JW song "A Lifetime of Contradictions" (矛盾一生) was the first to be widely noticed. JW's singing of "A Lifetime of Contradiction", which received over 18 million views, revitalised her previously flagging career. Lam subsequently finished two more songs for JW: "How Many Years" (多少年) and "Free to Soar" (自由飛翔). When he began composing songs, Lam was a huge fan of the Taiwanese singer Yoga Lin and Lam sent him a message with demos of songs he had composed on social media. Lin performed some of Lam's songs which led to the two forming a strong bond. Songs composed by Lam that were sung by Lin include "Bad and Worse" (壞與更壞), which was Lin's first Cantonese song, and "Do Not Forget You" (勿忘你). In 2016 and 2017, Lam received the composer award at RTHK's "Top Ten Chinese Gold Songs Award" ceremony.

According to HK01, he has collaborated with most of Hong Kong's singers who are currently active in the industry. He has written songs for the singers Charmaine Fong, Pakho Chau, JW, Alfred Hui, Jason Chan, Joey Yung, Hins Cheung, Janice Vidal, and Eman Lam. Lam composed Joey Yung's song "The Science of Heart" (心之科學), which received an Ultimate 903 award in 2018. Lam composed Hong Kong singer Miriam Yeung's song "Cherie Yu" (余春嬌), Eman Lam's song "Love Is A French Dessert" (愛情是一種法國甜品), and Taiwanese singer Rainie Yang's "Showing One's Incompetence" (獻醜), Alfred Hui's "Single" (單數), and Hins Cheung's "Diving" (潛水). It takes him roughly one day to write a song. With his elder brother, he manages a music production company. His duties include making new music available for purchase and for radio broadcasts. He established Terence Lam Production & Company to assist him in retaining the copyright over his compositions.

In 2019, he began his singing career after participating in a singing contest. That year, he did a Mandarin duet for a movie theme song with JC of the song "Lost In Love" (如影隨心), which sparked his desire to do more singing. In January 2019, he released the song "NEXT" (下一位前度), the first song that made him well-known as a singer. The song hit several major charts. Lam collaborated with Christopher Chak [zh] on the song's composition. Chak suggested including vocal music and inversion in the piece which demonstrated Lam's musical abilities. In 2019, Lam wrote and sang the songs "just carry on" and "Listen to Wind" (聽風), the latter of which he also arranged. The two songs did not receive as much as attention as "NEXT". For "just carry on", Lam said that the song likens people to flowers that bloom at different times. Its message is that people do not need to compare themselves with each other. The song's music video features four new actors including Rachel Leung and Will Or to accompany Lam in acting various scenes of people being in a "collapsed state". As Lam had trouble acting in the scenes, the directors needed to have everyone leave before filming his parts.

Lam composed fewer songs in 2019 than he did in previous years as he was adjusting to becoming a performer and as his energies were focused on promoting his work and planning. He composed two or three songs that year. During the 2019 Ultimate Song Chart Awards hosted by Commercial Radio Hong Kong, Lam received the best new artist award.