Robert Arthur King (9 April 1886 – 27 February 1960) was an Australian politician.
He was born in Launceston to tailor Robert King and Louisa Barrett.
He was closely involved in the Saddlers' Union and was also active in the Trades and Labor Council.
King was appointed to the New South Wales Legislative Council in 1931, and played an active part in the turmoil in Labor politics throughout the subsequent decade.
Readmitted to the formal Labor Party in 1939, he also served as vice-president of the Australian Council of Trade Unions from 1935 to 1960.