Jacob Crowninshield (March 31, 1770 – April 15, 1808) was a U.S.
Representative from Massachusetts and appointee to the position of U.S.
Secretary of the Navy, which he never filled.
His brother Benjamin Williams Crowninshield did successfully hold the post; the Crowninshield family in general was prominent in early American maritime affairs.
His ancestor, Johann Casper Richter von Kronenscheldt, immigrated from Leipzig.