Ion Grant Neville Keith-Falconer (5 July 1856 – 11 May 1887) was a Scottish missionary and Arabic scholar, the third son of the 8th Earl of Kintore.

Keith-Falconer was born in Edinburgh. After attending Harrow School and studying at the University of Cambridge, he moved into evangelistic work in London. In 1886, he was appointed Arabic professor at Cambridge, but his career was cut short near Aden while in missionary work. He translated the Fables of Bidpaï. He was an athlete, a champion cyclist and is described as a world cycling champion in 1878.