Reginald Percy Gaddum (28 July 1898 – 1957) was a tea planter in Ceylon and a member of parliament from 1952 to 1956. Reginald Percy Gaddum was born in 1898 at Gona Adika Estate in Gampola, the son of George Percy and Jessie Doris. His father was an Englishman who had arrived in Ceylon in 1891. Gaddum began his planting career as a "creeper" at the age of 15 years. In 1935 he became the youngest Chairman of the Planters' Association of Ceylon, a position in which he served for three years. On 30 April 1938 he was appointed as a member of the 2nd State Council of Ceylon, following the resignation of Evelyn Charles Villiers. In 1939, he became a director of a commercial firm and resigned from the State Council on 10 January.