Lieutenant-Colonel James Augustus Grant CB CSI FRS FRGS (11 April 1827 – 11 February 1892) was a Scottish explorer of eastern equatorial Africa.

[2] He returned to England in 1858, and in 1860 joined John Hanning Speke in the memorable expedition which solved the problem of the Nile sources.

[1] The expedition left Zanzibar in October 1860 and reached Gondokoro, where the travellers were again in touch with what they regarded as civilization, in February 1863.

[2] In 1864 he published, as supplementary to Speke's account of their journey, A Walk across Africa,[5] in which he dealt particularly with "the ordinary life and pursuits, the habits and feelings of the natives" and the economic value of the countries traversed.

[2] In his book, A Walk across Africa, Grant gives the following description of his illness, which broke out when they reached the native kingdom of Karague, on the western side of Lake Victoria in December 1861.