Hayashi Gonsuke (林 権助, March 23, 1806 – June 27, 1868) was a Japanese samurai of the late Edo period.
Fighting at the various skirmishes in the 1860s, he most notably fought alongside Shinsengumi against Maki Izumi's force at Tennozan.
Commanding Aizu artillery forces at the Battle of Toba–Fushimi, Gonsuke fought against overwhelming odds, coming under heavy fire while inadequately supported by spearmen instead of rifle infantry.
Evacuated from the battlefield, he was placed on a Shogunate warship, and died at sea, en route to Edo.
Gonsuke's ancestor Matazaburō was famous for having served under Torii Mototada and died at the Battle of Fushimi Castle.