Oliver Arthur King (1855, Islington, London - 23 August 1923, Hammersmith, London) was a British composer, pianist, organist and conductor.

Oliver King started learning piano at 6-years old, he was noticed by Joseph Barnby for his talent, and made King a choirboy in the St. Andrew's Church which he excelled in the role. He learned the organ and became a deputy organ and assistant to Joseph Barnby until 1874 when he moved to Leipzig University to study. After Leipzig, King moved back to London as a skilled pianist and was appointed the pianist to Princess Louise in 1879. During her trip to Ottawa, King played in several performances, touring across Canada and America as a pianist and composer.

After his stay in North America from 1879 to 1883, King moved back to London, with his reputation of being the pianist to Her Royal Highness Princess Louise, he became the organist of the Novello Oratarios and a popular composer of chants and anthems. He wrote a concert-overture "Among the Pines" which won a prize from the Royal Philharmonic Society. His popularity was only in England and he wasn't able to achieve much fame in the rest of Europe. His performance activity died down, although a professor of piano in the Royal Academy of Music, his main musical activities lessened especially after the beginning of the 20th-century, and King died at the age of 68 in Hammersmith.