Mrs. Ethel St. Clair Grimwood, also known as Ethel Moore, is a British lady who became to be known as the Heroine of Manipur in the History of modern Manipur. She is main person behind the devising of plans for the escape of Tikendrajit Singh from the several capture attempts of the British Army. She is the authoress of the "My Three Years in Manipur and Escape from the Recent Mutiny", published in 1891, the same year of the outbreak of the Anglo-Manipur War.