Jakob Ploompuu (11 October 1872, Koitjärve (now Kuusalu Parish), Kreis Harrien – 13 September 1948, Koitjärve) was an Estonian journalist, publisher and politician.
He was a member of the Estonian Constituent Assembly.
He became a member of the assembly on 12 March 1920.
He replaced Karl Kirp.
This article about an Estonian politician is a stub.