50°55′N 2°18′W / 50.92°N 2.3°W / 50.92; -2.3 Sturminster Newton Hundred or Sturminster Newton Castle Hundred was a hundred in the county of Dorset, England, containing the following parishes:

• Hinton St Mary
• Margaret Marsh
• Marnhull
• Okeford Fitzpaine
• Sturminster Newton

• List of hundreds in Dorset

• Boswell, Edward, 1833: The Civil Division of the County of Dorset (published on CD by Archive CD Books Ltd, 1992)
• Hutchins, John, History of Dorset, vols 1-4 (3rd ed 1861–70; reprinted by EP Publishing, Wakefield, 1973)
• Mills, A. D., 1977, 1980, 1989: Place Names of Dorset, parts 1–3. English Place Name Society: Survey of English Place Names vols LII, LIII and 59/60