Sir Derrick Wellesley Gunston, 1st Baronet MC, (26 February 1891 – 13 July 1985) was a Unionist politician in the United Kingdom. Gunston served with the Irish Guards in World War I and was awarded the Military Cross in 1918. He was elected at the 1924 general election as Member of Parliament (MP) for the Thornbury constituency, in Gloucestershire, and held the seat until his defeat at the 1945 general election by the Labour Party candidate, Joseph Alpass. In February 1938, he was made a Baronet, of Wickwar in the County of Gloucester.