The Lagos Auxiliary, unlike its comtemporary, the Gold Coast Aborigines Rights Protection Society, was not an independent body. Rather, it was a committee of the Anti-Slavery and Aborigines Protection Society of London. The Auxiliary was an important organization of the second decade of the twentieth century. Its success was marred by the power struggle between warring factions in Lagos politics in this protonationalist period. The Lagos Auxiliary floundered when characters as Herbert Macaulay, Mojola Agbebi, Christopher Alexander Sapara Williams, Oguntola Sapara, John Randle, and Orisadipe Obasa could not work together amicably. The Auxiliary was also handicapped by its alliance with the Anti-Slavery and Aborigines Protection Society of London. The English Humanitarians proved to be unwilling to accept the leadership of educated Africans. The Auxiliary has received only passing mention from historians of Nigerian nationalism. This article is an attempt to assess the contributions of the Lagos Auxiliary to the history of Nigerian nationalism. Notes.