Nathaniel Day Cochrane (bapt. 22 November 1780 – 16 November 1844) was a British naval officer. He was born in Québec, the illegitimate son of Paymaster Hon. John Cochrane, third (surviving) son of Thomas Cochrane, 8th Earl of Dundonald, and Geneviève Dulan. Nathaniel had a sister, Angelica, a brother, Colonel James Johnson Cochrane of the 3rd Guards, and a half-brother (probably) John Cochrane, a lawyer. This John Cochrane may have been John Cochrane the well-known chess master. On 23 November 1841 he was promoted to Rear-Admiral of the Blue.