Alexander Keith Johnston (1844–1879)

Alexander Keith Johnston (November 11, 1844 in Edinburgh – June 28, 1879 in Tanzania) was a Scottish explorer and geographer.

He was the son of published geographer Alexander Keith Johnston (1804–1871) and Mary Grey.

From 1873 to 1875 he was geographer to a commission for the survey of Paraguay. He led a Royal Geographical Society expedition to Lake Nyasa and Tanganyika. Johnston died in Beho Beho in South Africa after 6 months of this expedition from malaria and dysentry.

He is remembered on his father's grave in Grange Cemetery in Edinburgh.