Oswald Curtis (1821–1902) was a 19th-century New Zealand politician born in London, England, on 20 January 1821. He was the son of Stephen Curtis and Eleanora Llewellyn. He migrated to Nelson in 1853, arriving on 18 June.
Curtis had been a passenger on the barque Mahomed Shah. The ship sailed from England for New Zealand on 15 January 1853. On 18 April, about 400 miles south of Cape Leeuwin, the ship caught fire. All on board were rescued two days later by the brig The Ellen under Captain Pardon. The Ellen was sailing from Mauritius to Hobart. The ship's position was given as 40°10′00″S 119°10′00″E / 40.16667°S 119.16667°E. Those rescued were taken to Hobart, arriving there on 6 May 1853.
He was a member of the Nelson Provincial Council from 1857 to 1867, becoming its Superintendent in March 1867 when Alfred Saunders resigned. He remained Superintendent until 1876 when the Provinces were abolished. Curtis was also a Member of Parliament for the City of Nelson from 1866 to 1879, when he was defeated. During his term as a member of Parliament, for one month between 10 September and 11 October 1872 Curtis was Commissioner of Stamps and Customs, Post-Master General and Telegraphs Commissioner under the short lived third Stafford Ministry.
As Superintendent, Curtis opened the Nelson Waterworks on 16 April 1868 and turned the first sod at Stoke for the cutting of the Nelson-Foxhill Railway on 6 May 1873.