Jacob (Jaap) Frederik Klinkhamer (born 21 June 1854 in Amsterdam; died 12 December 1928 in The Hague) was a Dutch architect and professor of architecture. He designed several buildings in the Netherlands, Dutch East Indies and South Africa.
Klinkhamer studied in Delft at the then Polytechnic, where in 1878 he graduated as a civil engineer. He started in 1882 as an independent architect in Amsterdam. With Dolf van Gendt he designed the Granary Korthals Altes (ca. 1895). He designed railroad building including Main II (Utrecht, ca. 1893), an office building for the NISM (Semarang, circa 1902) and the station building of Soestdijk and Baarn Station (both about 1897). He also designed villas and houses. Several of his works are recognized as significant. He worked with John Springer, B.J. Ouëndag and Cosman Citroen. From 1905 to 1 September 1924 he was Professor of Civil Engineering in Delft.
He married Margaret Elizabeth Bosscha, daughter of the professor / director John Bosscha Jr. and they had six children. He died at the age of 76 years in The Hague and was cremated in Westerveld.