Major-General Sir Oliver Richardson Newmarch KCSI (1834–1920) was a senior British Indian Army officer who served as Military Secretary to the India Office.

Born the son of Doctor Newmarch and Violet, daughter of Colonel Sherwood, Royal Artillery, Newmarch was educated at Charterhouse School and Merton College, Oxford.

[1] Newmarch entered the Indian Army in 1855, and was later commissioned into the Bengal Staff Corps and posted to the 44th Native Infantry.

[2][3] Newmarch saw service during the Indian Mutiny and received a medal for his work during it.

[3] Newmarch was appointed Military Secretary to the India Office in 1889 and served in that role until 1899.