Thedwastre was a rural district in West Suffolk, England from 1894 to 1974. Thedwastre was formed under the Local Government Act 1894, from the part of the which was in West Suffolk (the rest forming East Stow Rural District in East Suffolk). It was named after the historic hundred of Thedwastre. The district was abolished in 1974, under the Local Government Act 1972, and went to form part of the Mid Suffolk district in Suffolk. Its boundaries never changed during its 80 years existence.