Jan Gratama (16 August 1877 – 12 December 1947), was a Dutch architect.
He was born in Groningen and was the younger brother of the artist and museum director Gerrit David Gratama.
His sister Lina Gratama (1875-1946) was a painter He studied at the Polytechnical School of Delft and became an amateur portrait artist like his older brother.
His partners in his architect bureau were Gerrit Versteeg from 1914 and Jan Willem Dinger from 1930, who continued the bureau after Gratama died in 1947.
Media related to Jan Gratama at Wikimedia Commons