Francis Robert Japp FRS (8 February 1848 – 1 August 1925) was a British chemist who discovered the Japp-Klingemann reaction in 1887.

He was born in Dundee, Scotland, the son of James Japp, a minister of the Catholic Apostolic Church.

He left the university because of health problems and stayed in Germany for two years from 1871 until 1873.

He started his studies at the University of Heidelberg with Robert Bunsen, where he received his PhD in 1875.

[1] Japp married Elizabeth Tegetmeyer of Nordhausen in 1879, with whom he had two sons and two daughters.